[Bug 1312043] [NEW] /usr/bin/muon-discover:6:__GI_raise:__GI_abort:qt_message_output:qt_message:qFatal

[errors.ubuntu.com bug bridge]

Public bug reported:

[Impact]

the new sourcelist api in qapt forgets to do a size check after string editing, thus running into an assert on qstring::at(0) being called on an empty string.
this was resolved by making sure that the value passed to at() is actually a valid index.

[Test Case]

* edit /etc/apt/sources.list
* add a line consisting of two hash signs "##"
* save
* start muon-discover
* click sources tab at the top
* should not crash

[Regression Potential]

N/A. SourceEntry tests continue to pass, new test was added.

[Other Info]

N/A

----

The Ubuntu Error Tracker has been receiving reports about a problem
regarding muon.  This problem was most recently seen with version
2.2.0-0ubuntu3, the problem page at
https://errors.ubuntu.com/problem/93fcb3147d466be239a79f223d19683695eb414e
contains more details.

** Affects: qapt (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: qapt (Ubuntu Trusty)
     Importance: Undecided
         Status: New

** Affects: qapt (Ubuntu Utopic)
     Importance: Undecided
         Status: New


** Tags: trusty

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https://bugs.launchpad.net/bugs/1312043

Title:
  /usr/bin/muon-
  discover:6:__GI_raise:__GI_abort:qt_message_output:qt_message:qFatal

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