After doing all the work to compute the target ValueObject we want to evaluate, make sure we actually got something before proceeding.
After doing all the work to compute the target ValueObject we want to evaluate, make sure
we actually got something before proceeding.

<rdar://problem/16282875>


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@203591 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb