[Libreoffice] [REVIEW] Crasher fix for fdo#37252

[Kohei Yoshida]

The attached patch fixes a crasher reported in

https://bugs.freedesktop.org/show_bug.cgi?id=37252

The original code always assumed that the find call on the map
container always finds a match (as it didn't check against the end
iterator after the call returns), but apparently in some cases no
match can be found.  The attached patch simply checks for the end
iterator position, and if no match is found, it simply returns right
there.

I'd like to commit this into the 3.4 branch and the 3.4.0 branch as
well (if we've already branched).

Thanks,

Kohei
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