Use a better check for existence of the NERDTree buffer. #814
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If the user wipes out or deletes (:bw or :bd) the NERDTree buffer, there is still a tab variable that hangs onto the name of that now-missing buffer. Checking only that variable is not enough to decide whether to create a new NERDTree or use the existing one. Fortunately, there already is a function with a more complete check: ExistsForTab()
This was referenced Apr 25, 2018
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Fixes #813.
If the user wipes out or deletes (:bw or :bd) the NERDTree buffer, there
is still a tab variable that hangs onto the name of that now-missing
buffer. Checking only that variable is not enough to decide whether to
create a new NERDTree or use the existing one. Fortunately, there
already is a function with a more complete check:
ExistsForTab()