Fix issue where bulkdata was accidentally closed

nilmdb/server/nilmdb.py

@@ -119,8 +119,9 @@ class NilmDB(object):
         self.con = sqlite3.connect(sqlfilename, check_same_thread = True)
         try:
             self._sql_schema_update()
-        finally: # pragma: no cover
+        except Exception: # pragma: no cover
             self.data.close()
+            raise
 
         # See big comment at top about the performance implications of this
         self.con.execute("PRAGMA synchronous=NORMAL")