fix empty component template error

[amiarSlimane]

when we have an empty template the compiler is throwing an error, this error is caused by calling override function of magic-string with wrong arguments, i believe that checking that start is always below end will prevent the error from happening

An example of an empty template: <template></template>

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[NullVoxPopuli]

Thank you!!!

[NullVoxPopuli]

I've ported this fix over to ember-template-imports as well: ember-cli/ember-template-imports#146

[amiarSlimane]

you are welcome.