Fsdk: fix VsWhere when no entries are returned #1493

Job	Run time
linux-oldLTS-github--dotnet-and-xbuild	7m 50s
macOS--mono	6m 48s
linux-oldLTS-github--dotnet-and-msbuild	8m 57s
macOS--dotnet6-and-mono	8m 40s
linux-newLTS-github--dotnet-and-msbuild	8m 19s
linux-newLTS-github--dotnet-and-xbuild	8m 41s
linux-oldLTS-vanilla--newmono	8m 6s
linux-oldLTS-vanilla--stockmono	5m 53s
linux-newLTS-vanilla--stockmono	5m 7s
linux-newLTS-vanilla--newmono	6m 18s
linux-newLTS-vanilla--dotnet6	8m 46s
windows--dotnet6	9m 12s
windows--legacyFramework	16m 13s
sanity-check	1m 2s
publish	57s
	1h 50m 49s

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