Selecting empty csv file throws an Exception

**System Information (please complete the following information):**
- (No idea where I can get Model builder version)
- Visual studio version is 17.11.0 Preview 7.0

**Describe the bug**
When I select Question Answer template, and then select empty file it throws an Exception

**To Reproduce**
Steps to reproduce the behavior:
Create Machine learning model
Select a Question Answering template (Local)
Press next step
Browse
Select an empty csv file

**Expected behavior**
I would expect some message that the file is empty.

**Error**
Unable to parse file. Only comma, tab or semi-colon delimited files are allowed.

at StreamJsonRpc.JsonRpc.d__154`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.ML.ModelBuilder.Actions.DataTextActions.d__14.MoveNext() in /_/src/Microsoft.ML.ModelBuilder/Actions/DataTextActions.cs:line 284
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.ML.ModelBuilder.Actions.DataTextActions.d__2.MoveNext() in /_/src/Microsoft.ML.ModelBuilder/Actions/DataTextActions.cs:line 61
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.ML.ModelBuilder.ToolWindows.DataTextViewModel.d__136.MoveNext() in /_/src/Microsoft.ML.ModelBuilder/ViewModels/DataTextViewModel.cs:line 683
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.ML.ModelBuilder.ToolWindows.TextDataControl.<b__3_0>d.MoveNext() in /_/src/Microsoft.ML.ModelBuilder/ToolWindows/DataTabComponents/TextDataControl.xaml.cs:line 69

**Screenshots**

Start with Microsoft.ML.ModelBuilder/Actions/DataTextActions.cs around line 284 and follow the call through ViewModels/DataTextViewModel.cs around line 683. Reproduce the Question Answering template flow with an empty CSV, then verify that it reports the file is empty instead of the delimiter exception.

Written by the indexing model from the issue text.