Bugzilla-assistant updates

[Rob Snelders]

Hi,

These 2 patches fix 2 bugs of the bugzilla-assistant:
- *Bug 53082* <https://bugs.freedesktop.org/show_bug.cgi?id=53082> 
-BUGZILLAASSISTANT: Improve exception handling for unavailable Bugzilla
- *Bug 50851* <https://bugs.freedesktop.org/show_bug.cgi?id=50851> 
-BUGZILLAASSISTANT: Error message should be in focus

Please add them to the repository (with the 1 I send earlier today) and 
update the BSA.
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