Fix compile errors in fsyacc's output if there is no header in the input file. #228
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The header in
.fsy
files is optional. However if it does not exist, FsYacc will emit a#0 ""
line directive in the source file, and the compiler will not like the empty string in the file name. This PR fixes FsYacc to not emit any line directives if the header is empty.Validated by removing the header from the mini project.