Show error message when db failed to rebuild (#2043)

* Show error message when db failed to rebuild; fix #1908;

* Forgot file

src/Db/Db.py

@@ -264,6 +264,7 @@ class Db(object):
                     changed_tables.append(table_name)
             except Exception as err:
                 self.log.error("Error creating table %s: %s" % (table_name, Debug.formatException(err)))
+                return False
 
         self.log.debug("Db check done in %.3fs, changed tables: %s" % (time.time() - s, changed_tables))
         if changed_tables:

src/Site/SiteStorage.py

@@ -138,7 +138,11 @@ class SiteStorage(object):
         self.event_db_busy = gevent.event.AsyncResult()
 
         self.log.info("Creating tables...")
-        self.db.checkTables()
+        changed_tables = self.db.checkTables()
+        if not changed_tables:
+            # It failed
+            # "Error creating table..."
+            return False
         cur = self.db.getCursor()
         cur.logging = False
         s = time.time()