[17.12] Add back null check to allow merge editor to load #11255
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Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2302211
This change adds a null check to ProjectCapabilityResolver.ContainingProjectHasCapability(...) that was incorrectly removed by 6cd5bd4. Without this null check, it is impossible to open a merge editor for a razor or cshtml file. The merge editor has a few editors within it, and some of them are not included in a project, so they have a null IVsHIerarchy.