Fix mail content in sometime can't see table.
Fix mail content in sometime can't see table.

masato25/open-falcon-backend,Cepave/alarm,Cepave/alarm,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,Cepave/open-falcon-backend,Cepave/open-falcon-backend,Cepave/alarm,masato25/open-falcon-backend,Cepave/alarm