[PATCH] Avoid crash if some hosts have no arches

[Chenxiong Qi]

Hi,

I just built the local development environment and ran koji, then encountered this problem.

Field arches in table host could be null. If some hosts have no arches, and arches' value is null, arches.split() will fail.


Regards,

--
Chenxiong Qi (齐辰雄)
Senior Software Engineer / RHCE
Red Hat Infrastructure Engineering & Development, Beijing
Mobile: 13693137105
IRC: #hss, #section5, #pdc, #tps

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