Do not report zero length diagnostic #2274

Job	Run time
pre_build	3m 44s
build_code_fixes	1m 4s
build_analyzers (analyzers, Analyzers, Analyzers)	1m 12s
build_core_cli	45s
build_core_and_testing	52s
build_analyzers (formatting_analyzers, Formatting.Analyzers, FormattingAnalyzers)	1m 7s
build_analyzers (code_analysis_analyzers, CodeAnalysis.Analyzers, CodeAnalysisAnalyzers)	55s
build_framework_cli	2m 24s
build_refactorings	1m 4s
build_vs_extension	3m 13s
build_vs_code_extension	1m 4s
publish_nuget_packages	0s
publish_ovsx_extension	0s
publish_cli_nuget_packages	0s
publish_vs_code_extension	0s
publish_vs_extension	0s
	17m 24s

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