* Don't use strlen(..) > 0 or == 0, simply check the first character
  against 0;
* Fix a return without a value (my bad in last commit);
* Fix storing a literal in a non-const string.

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@5610 ea778897-0a13-0410-b9d1-a72fbfd435f5