Avoid playback segfault on empty file list53x

[wmtan]

When running the mixing module in playback mode, if the secondary input source is given an empty file list, a segfault resulted when attempting to throw an exception. This pull request fixes the segfault so that the exception is thrown.
This pull request also improves exception messages that occur on an empty file list for the secondary source when playback mode is not used.
This code bug has been there for a long time. This segfault has been observed as far back as 5_3_X.
Pull request requested in 5_3_X by David Lange.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_5_3_X.

Avoid playback segfault on empty file list53x

It involves the following packages:

IOPool/Input

@cmsbuild, @Degano, @Dr15Jones, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
@smuzaffar you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[Dr15Jones]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_5_3_X IBs unless changes or unless it breaks tests. @smuzaffar can you please take care of it?

[smuzaffar]

+tested
@davidlange6, we should also include this in next 53X patch release

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_5_3_X IBs unless changes (tests are also fine). @smuzaffar can you please take care of it?

[davidlange6]

+1

yes. Thanks
On Mar 5, 2014, at 2:35 PM, Malik Shahzad Muzaffar notifications@github.com
wrote:

+tested
@davidlange6, we should also include this in next 53X patch release

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