Fix: Check existence of template content before formatting SMS content

[mdilshan]

When there's no template code is selected in the SMS provider editor page, the formatted SMS body ended up with unnecessary characters.

This fix checks if the template code exists before formatting the code.

Note: Updated all places but only tested with Twillio as I only got Twillio account

[CLAassistant]

All committers have signed the CLA.

[hsluoyz]

@mdilshan you are adding the same code to each implementation. Why not add the code in https://github.com/casdoor/casdoor ?

[hsluoyz]

Should make it in: https://github.com/casdoor/casdoor , closed here

[mdilshan]

@mdilshan you are adding the same code to each implementation. Why not add the code in https://github.com/casdoor/casdoor ?

Well the code is already duplicated ( Per each SMS provider ) in here, so went with the same pattern and only some SMS providers uses the template. So better to add it in here.