Fix empty shader resource loading #81300
Merged
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Regression from #80705.
String.parse_utf8()
returns an error when given string size of 0 and null, so we have to manually check this first. Otherwise, loading a completely empty .gdshader or .gdshaderinc file will fail. The workaround is easy, just add a space or newline to the file using an external text editor and it will load normally again.