Edited Issue: Unhandled ArgumentException when using invalid filename [895]

```
mscorlib_ni!System.IO.Path.CheckInvalidPathChars
mscorlib_ni!System.IO.Path.GetFileName
microsoft_nodejstools!Microsoft.NodejsTools.Debugger.SourceMapper.MapToOriginal
microsoft_nodejstools!Microsoft.NodejsTools.Debugger.NodeDebugger.GetOrAddModule
microsoft_nodejstools!Microsoft.NodejsTools.Debugger.NodeDebugger.AddModules
microsoft_nodejstools!Microsoft.NodejsTools.Debugger.NodeDebugger.OnCompileScriptEvent
microsoft_nodejstools!Microsoft.NodejsTools.Debugger.Communication.DebuggerClient.HandleEventMessage
microsoft_nodejstools!Microsoft.NodejsTools.Debugger.Communication.DebuggerClient.OnOutputMessage
microsoft_nodejstools!Microsoft.NodejsTools.Debugger.Communication.DebuggerConnection+_ReadStreamAsync_d__d.MoveNext
mscorlib_ni!System.Runtime.CompilerServices.AsyncMethodBuilderCore._ThrowAsync_b__5
mscorlib_ni!System.Threading.QueueUserWorkItemCallback.WaitCallback_Context
mscorlib_ni!System.Threading.ExecutionContext.RunInternal
mscorlib_ni!System.Threading.ExecutionContext.Run
mscorlib_ni!System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem
mscorlib_ni!System.Threading.ThreadPoolWorkQueue.Dispatch
mscorlib_ni!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback
```

We should handle the exception rather than crash VS.