updated build rules to fix the generation of python init files for deleted packages

[smuzaffar]

fixes the bug reported : https://hypernews.cern.ch/HyperNews/CMS/get/recoDevelopment/1558.html

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch IB/CMSSW_10_0_X/gcc630.

@cmsbuild, @smuzaffar, @gudrutis, @mrodozov can you please review it and eventually sign? Thanks.
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[cmsbuild]

The tests are being triggered in jenkins.
Using cmssw from cms-sw/cmssw#21456
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/24673/console
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/24675/console
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/24683/console

[cmsbuild]

+1
Tested at: 7eb5ac7
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-21456/24683/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
cms-sw/cmssw@bc446a7
cms-sw/cmssw@8c36002
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3599/24683/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3599/24683/git-merge-result

[cmsbuild]

Comparison job queued.