Alex Gaynor 845abfd810 Handle null in this function
Since ddb9ef30dc41715ff30c1178f3830e35e26cd042 in zuul ids will get
serialized as null for periodic jobs. After some of the code moved
around, this became a place where they were unhandled.

If you try to look at the status page while periodic jobs are running
without this patch, nothing will display.

Change-Id: I2cdf72a1532093e33039dcc0199cde0a0758cab1
2013-10-01 23:15:21 -07:00
..
2013-09-06 13:29:04 -07:00
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