Created attachment 112862 [details]
Patch that extends the fallback behaviour on failed icon loading to exceptions of type "Gdk::PixbufError"

Due to another bug [1] the MIME type guessing of PNG files was broken on my Ubuntu system. This made pavucontrol crash on startup (while loading the necessary icons) without a helpful error message (requiring a lot of debugging effort). Although this is not originally pavucontrol's fault, I think that pavucontrol could be more robust about such a problem, especially because: A) In a complex database like the one to guess MIME types (that is populated from hundres of different packages) this can happen from time to time and B) pavucontrol already has some fallback options in place - they are just not active in this specific case.

Specifically, the function "set_icon_name_fallback" already catches several exceptions ("Gtk::IconThemeError" and "Gio::Error") about failed loading of icons and falls back to just setting the name and using a default icon. I think it's in the spirit of that code to extend that behaviour to the additional exception type "Gdk::PixbufError", which is the exception that is thrown, if an icon cannot be loaded due to broken MIME type guessing. Find a patch attached that implements this.