Suppress empty bibliography warnings

Question

I have solution (due to "moewe") for my specific problem of sorting in BiBLaTeX and numbering.

BiBLaTeX Part 1 and BiBLaTeX Part 2

The both problems has been solved like below:

\documentclass[10pt,oneside,a4paper]{book}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[backend=biber,language=english, style=numeric, ,citestyle=numeric,giveninits=true,dashed=false,
bibstyle=authoryear,refsegment=chapter,backref=true]{biblatex}
\BiblatexSplitbibDefernumbersWarningOff
\DeclareSortingTemplate{none}{
  \sort{\field{presort}}
  \sort{\citeorder}
  \sort{\intciteorder}
}
\DeclareSourcemap{
  \maps[datatype=bibtex]{
    \map{
      \pertype{book}
      \step[fieldset=presort, fieldvalue=aa]
    }
    \map{
      \pertype{article}
      \step[fieldset=presort, fieldvalue=bb]
    }
    \map{
      \pertype{online}
      \step[fieldset=presort, fieldvalue=cc]
    }
    \map{
      \pertype{inproceedings}
      \step[fieldset=presort, fieldvalue=dd]
    }
  }
}
\makeatletter
\input{numeric.bbx}
\makeatother
\DeclareNameAlias{author}{family-given}

\DeclareNameAlias{translator}{family-given}

\renewcommand*{\revsdnamepunct}{}
\defbibheading{subsubbibintoc}[\refname]{\subsection{#1}} 
\defbibheading{subsubbibliography}[\refname]{\subsection{#1}}
\addbibresource{biblatex-examples.bib}
\begin{document}
\tableofcontents
\chapter{Chapter 1}
Lorem \autocite{sigfridsson}
ipsum \autocite{nietzsche:ksa1}
dolor \autocite{moraux}
sit \autocite{knuth:ct:c}~\autocite{spiegelberg}.
\printbibheading[title=Chapter bibliography,heading=subbibintoc]
\printbibliography[segment=\therefsegment,type=book,heading=subsubbibintoc,title={Books}]
\printbibliography[segment=\therefsegment,type=article,heading=subsubbibintoc,title={Articles}]
\printbibliography[segment=\therefsegment,type=online,heading=subsubbibintoc,title={Online}]
\printbibliography[segment=\therefsegment,type=inproceedings,heading=subsubbibintoc,title={Conferences}]
\vspace{5mm}
{\let\clearpage\relax \chapter{Chapter 2}}
Lorem~\cite{vizedom:related}
ipsum~\cite{gerhardt}
dolor~\cite{augustine}
sit~\cite{ctan}.
\printbibheading[title=Chapter bibliography,heading=subbibintoc]
\printbibliography[segment=\therefsegment,type=book,heading=subsubbibintoc,title={Books}]
\printbibliography[segment=\therefsegment,type=article,heading=subsubbibintoc,title={Articles}]
\printbibliography[segment=\therefsegment,type=online,heading=subsubbibintoc,title={Online}]
\printbibliography[segment=\therefsegment,type=inproceedings,heading=subsubbibintoc,title={Conferences}]
\vspace{5mm}
{\let\clearpage\relax \chapter{Chapter 3}}
Lorem~\cite{wassenberg},
ipsum~\cite{baez/online}.
\printbibheading[title=Chapter bibliography,heading=subbibintoc]
\printbibliography[segment=\therefsegment,type=book,heading=subsubbibintoc,title={Books}]
\printbibliography[segment=\therefsegment,type=article,heading=subsubbibintoc,title={Articles}]
\printbibliography[segment=\therefsegment,type=online,heading=subsubbibintoc,title={Online}]
\printbibliography[segment=\therefsegment,type=inproceedings,heading=subsubbibintoc,title={Conferences}]
\printbibheading[title=Global bibliography at the end,heading=bibintoc]
\printbibliography[type=book,heading=subsubbibliography,title={Books}]
\printbibliography[type=article,heading=subsubbibliography,title={Articles}]
\printbibliography[type=online,heading=subsubbibliography,title={Online}]
\printbibliography[type=inproceedings,heading=subsubbibliography,title={Conferences}]
\end{document}

Using the code I have 6 warnings"

It should be like that because it gives me the info that in some Chapter I didn't use articles for example etc. Majority of the users (including moewe - thank you again) just accept the warnings...me too...but I need a possibility to OFF such a warnings and simple:

\usepackage {silence}
\WarningFilter  {biblatex}{Empty bibliography on input line 65.}

doesn't work because there is page number different in any time...etc.

My explanation why I need it. For instance in case when I know that I have 100% well done my job or I share my job with someone else and I have knowledge that there are a few acceptable warnings (my job is ready) I make the OFF all warnings and continue my job. So instead of keeping track of whether there are some new warnings among many of the old ones I just OFF them all and when appear again others I have an info that something WRONG is going with my job. The make OFF this specific warnings is a challenge for me then I ask about some help.

Answer 1

You can use

\usepackage{silence}
\WarningFilter{latex}{Empty bibliography}

or

\makeatletter
\def\blx@warn@bibempty{}
\makeatother

(the latter only works after biblatex is loaded).

With the former we use the silence package to filter out the warning. Perhaps unexpectedly biblatex does not issue the empty bibliography warning under its own name, but rather produces a generic LaTeX warning (presumably it replicates the standard behaviour of BibTeX-generated bibliographies to make it easier for tools that parse the .log output to see what's going on), so we need \WarningFilter{latex} and not \WarningFilter{biblatex}. Additionally, the filter text cannot contain the on line ... message, because that it added automatically by LaTeX and not seen by the message filtering code.

The second solution works by telling the macro that issues the relevant warning on the biblatex side to do nothing. Generally, biblatex does not always have a dedicated macro for all warnings available, but here you were lucky.