Fixed "AttributeError: 'MemoryReserver' object has no attribute 'logger'" in...

Fixed "AttributeError: 'MemoryReserver' object has no attribute 'logger'" in case MemoryReserver.disabled is True (bug introduced in b436e67b).
Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

gms_preprocessing/misc/locks.py

@@ -320,7 +320,10 @@ class MemoryReserver(object):
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         self.release()
-        self.logger.close()
+
+        if not self.disabled:
+            self.logger.close()
+
         return True if exc_type is None else False