Try and catch block for dbRebuild (#2047)

* Try and catch block for dbRebuild

* Use self.log.error and not logging

* Use self.log.error and not logging in SiteStorage also

* Check if the rebuild is working

src/Test/TestSiteStorage.py

@@ -20,3 +20,6 @@ class TestSiteStorage:
 
         # Subdir
         assert set(site.storage.list("data-default")) == set(["data.json", "users"])
+
+    def testDbRebuild(self, site):
+        assert site.storage.rebuildDb()