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Merge pull request #101 from ESMCI/catch_svn_error

catch errors from svn status --xml
The issue is that the svn command actually produces a malformed xml output in this case which manage_externals attempts to parse before printing the error. This solution first attempts to parse the
xml returned from svn and bails and prints the raw output if it cannot. The resulting output is a little ugly but readable.

User interface changes?: No
[ If yes, describe what changed, and steps taken to ensure backward compatibilty ]

Fixes: #100

Testing:
test removed:
unit tests: all pass
system tests:
manual testing: Introduced a bad svn repo and tested

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