Bugfix: Only try to read a hdf5 header if hdf5 is actually found.
Bugfix: Only try to read a hdf5 header if hdf5 is actually found.

git-svn-id: fbbf69ba8011aca0e74e1c67904b11cccbdbe66b@27147 0785d39b-7218-0410-832d-ea1e28bc413d

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