Check result before grabbing index val

Author: hssyoo

awscli/telemetry.py

@@ -111,8 +111,8 @@ def _create_host_id_table(self):
 
     def _ensure_host_id(self):
         cur = self.execute(self._CHECK_HOST_ID)
-        host_id_ct = cur.fetchone()[0]
-        if host_id_ct == 0:
+        host_id_ct = cur.fetchone()
+        if host_id_ct and host_id_ct[0] == 0:
             self.execute(
                 self._INSERT_HOST_ID,
                 # Hardcode `0` as primary key to ensure