LoopedRandomInstantion with structs

[Vannevelj]

Right now it seems like we're not account for this to happen in a struct. Concerns this line at https://github.com/VSDiagnostics/VSDiagnostics/blob/develop/VSDiagnostics/VSDiagnostics/VSDiagnostics/Diagnostics/General/LoopedRandomInstantiation/LoopedRandomInstantiationAnalyzer.cs#L45:

while (!currentNode.IsKind(SyntaxKind.ClassDeclaration))

[Hosch250]

The problem there is that it just will not early-exit for struct--it will keep climbing the tree right up to the compilation syntax and crash when the node is null. The crash actually will only occur when the Random instantiation is not in a loop because it returns as soon as it reports the diagnostic.

I can fix this one.