Bug fixed in issue #92
searchbar.py : Changed index in tag_.manager.values to 
Issue #92 (closed)
In the search entry, When 'All' is selected from sources, it can't be removed by clicking the close button in the 'All' tag. It should be allowed, which shall search 'Local' only.
On clicking close button of any source _tag_button_clicked() is triggered which as output activates the All tag as intag_.manager.valu es[BaseModelColumns.ID] index is  which corresponds to "ALL", so changing index to  which activates local tag on clicking close button.