Check if a package exists before doing the read-tree

[ktf]

@ferriff had an issue where he got the following:

git cms-addpkg RecoLocalCalo/EcalRecProducer CMSSW_6_2_0_pre8
CMSSW environment not found. Checking out packages in /tmp/ferriff/src
You are on branch CMSSW_6_2_X
Checking out RecoLocalCalo/EcalRecProducer in tag CMSSW_6_2_0_pre8
error: Sparse checkout leaves no entry on working directory
fatal: Could not reset index file to revision 'CMSSW_6_2_0_pre8'

the actual error is a missing s in the name of the package, however the error message does not help. Maybe fix this by checking the index before doing the read-tree?

[smuzaffar]

has been implement #40

[cmsbuild]

A new Issue was created by @ktf Giulio Eulisse.

@Dr15Jones, @silviodonato, @dpiparo, @smuzaffar, @makortel can you please review it and eventually sign/assign? Thanks.

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