[packagekit] Make check problem with QPackageKit

[Richard Hughes]

Hey,

Your last commit has triggered a "make check" failure. I'm about to do
the release, so we need to fix this really quickly:

removing transaction from pool :  "/729_ebdcaacd_data" 
.......F...

!!!FAILURES!!!
Test Results:
Run:  10   Failures: 1   Errors: 0

1) test: TransactionTest::resolveAndInstallAndRemove (F) line: 39
transactiontest.cpp
assertion failed
- Expression: t != NULL
- installPackages

Please can you debug what the regression is please, or I'll have to
revert your patch for the release.

Thanks.

Richard.