Script is selecting all the objects (unwanted)

Question

Although my script works as it should I'm experiencing a odd behaviour when I run it, all the objects get selected and I have no idea why this is happening.

import bpy
import os
import subprocess
import math
from bpy.props import (
    FloatProperty,
    StringProperty,
)
from bpy_extras.io_utils import ImportHelper
from mathutils import Matrix, Vector
from bpy.types import (
    Header,
    Menu,
    Panel,
)
from math import isclose
class SelectByNameOperator(bpy.types.Operator):
    """Description"""
    bl_idname = "object.selected_by_name_operator"
    bl_label = "Select objects by name"
    bl_options = {'REGISTER', 'UNDO'}
name = StringProperty(
        name="Object name",
        )

def execute(self, context):
    for obj in bpy.context.scene.objects:
        if obj.name.startswith(self.name):
            obj.select_set(True)
            bpy.context.view_layer.objects.active = obj
        else: 
            obj.select_set(False)



    return {'FINISHED'}                 



class MyPanel(Panel):
    """Creates a Panel in the Object properties window"""
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "Test"
    bl_label = "Test"
    bl_idname = "MyPanel"
def draw(self, context):
    layout = self.layout

    box = layout.box()
    row = box.column()
    row.operator("object.selected_by_name_operator")



def register():
    bpy.utils.register_class(MyPanel)
    bpy.utils.register_class(SelectByNameOperator)
def unregister():
    bpy.utils.unregister_class(MyPanel)
    bpy.utils.unregister_class(SelectByNameOperator)
if name == "main":
    register()

Answer 1

All strings "start with nothing".

Simple test in python console

>>> x = "xxx"
>>> x.startswith("")
True

Similarly with your operator since the default value when not set of a string property is "".

Either test for this, or give it some default.

Note, there is already a similar op, to select all objects that start with "Cube"

>>> bpy.ops.object.select_pattern(pattern="Cube*")
{'FINISHED'}