<rdar://problem/16540961>

The "unexpected value" message only matters to me, but is bound to make the experience more confusing for people when some uninitialized memory looks like an NSNumber and then can't be formatted properly, and that error comes out in the UI

Just drop the error message entirely - nobody but me cares



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@205978 91177308-0d34-0410-b5e6-96231b3b80d8