Christopher Tate 9c2efb35e2 Sanity-check backup agent name prior to instantiation
Fixes a crash that would occur if an app with a pending backup
pass in the pipeline was updated to remove its agent declaration
from the manifest (or other more esoteric ways that a backup
pass was expected to run for an app without their own agent).

Bug 5776591

Change-Id: I5a8bc8c12de6a2bfa82f5093fe3a15b754109ab1
2012-03-23 13:00:05 -07:00
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