added missing import of array library (fix https://trac.osgeo.org/grass/ticket/2688)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@66268 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/temporal/space_time_datasets.py

@@ -11,6 +11,7 @@ for details.
 import getpass
 from abstract_map_dataset import *
 from abstract_space_time_dataset import *
+import grass.script.array as garray
 
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