Bug 516712: Allow checksetup.pl to upgrade installations from before 3.4 where profiles.extern_id contains multiple empty string values. Patch by Max Kanat-Alexander <mkanat@bugzilla.org> r=dkl, a=mkanat
Bug 516712: Allow checksetup.pl to upgrade installations from before 3.4 where profiles.extern_id contains multiple empty string values.
Patch by Max Kanat-Alexander <mkanat@bugzilla.org> r=dkl, a=mkanat

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