HydroDyn: check for valid file unit before attempting to close #207
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Turning off
Hdsum
in HydroDyn leads to a seg fault since HydroDyn tries to close a file which is not opened to begin with. This pull request checks for a valid file unit before attempting to close the HydroDyn summary file.This was reported at https://wind.nrel.gov/forum/wind/viewtopic.php?f=4&t=1111&start=15.