[task scheduler] getPatchStorage: if server is "", patch storage is ""
[task scheduler] getPatchStorage: if server is "", patch storage is ""

BUG=skia:5723

Change-Id: I2607ef5b32205ae7219d591a5a72f43388c95cf7
Reviewed-on: https://skia-review.googlesource.com/3304
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Reviewed-by: Ben Wagner <3ef7217be91069877d94f7907ce5479000772cd3@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot