[Libreoffice] Remove duplicate placeholder icons

[Joachim]

Hi,

The attached patch implements in the ImageList class a fallback to load 
a default icon if no one is found.

I have performed the following tests:

1st test I have done is adding the 'About Libre Office' entry to the 
standard toolbar, using an existing icon.
in ~/.libreoffice/.../lc_imagelist.xml there is the following entry:
<image:entry image:bitmap-index="0" image:command=".uno:About"/>
I replace .uno:About by .uno:AboutFoo, I restart soffice and the default 
icon is now loaded for the About button :-)


2nd test is removing from images.zip all the icons except the default one...
Find attached a screenshot of the result.
All buttons are now displayed with the default icon.


Regards,
Joachim.

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