Use Array.Empty in CompositeFileProvider

[lindexi]

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[ghost]

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[stephentoub]

@maryamariyan, this would have been caught by our static analysis, but it's been explicitly disabled:

runtime/src/libraries/Directory.Build.props

Lines 7 to 12 in 5d504c2

	<PropertyGroup Condition="$(MSBuildProjectName.StartsWith('Microsoft.Extensions.'))">
	<IsAspNetCoreApp>true</IsAspNetCoreApp>
	<!-- Temporarily ignore nit warning/errors (e.g. extra whitespace) from Extensions projects -->
	<NoWarn Condition="!$(MSBuildProjectName.EndsWith('.Tests'))">$(NoWarn);SA1129;SA1028;SA1027;SA1121;CA1200;SA1000;CA1507;CA1802;CA1825;CA1018;SA1648;CA2007;SA1001;SA1026;CA1810;SA1206</NoWarn>
	<NoWarn Condition="!$(MSBuildProjectName.Contains('ref'))">$(NoWarn);CS0618</NoWarn>
	</PropertyGroup>

Is there an issue tracking re-enabling that?

[stephentoub]

Is there an issue tracking re-enabling that?

I went ahead and fixed them.
#38090

[maryamariyan]

@stephentoub Thanks for the fix. Yes. I was keeping track here: #37821