Add check for valid Script Include name

[niamccash]

It seems possible to create a Script Include with an invalid name (eg. one with a space in the name) . Initially, the Script checker will complain about Javascript errors:

But it's possible to fix those errors, forget to fix the script name, and then save the record:

[designitsecure]

Hi, Is it ok if I work on this one?

[niamccash]

@designitsecure Go for it! If you submit a PR that solves this issue, you can tag it to automatically close the issue on merge - see https://github.com/ServiceNowDevProgram/Hacktoberfest/wiki/Reviewing-a-Pull-Request#auto-resolving-issues