Fix nulls in debug info dictionary

[xenolightning]

There is a possibility that a frame does not have any debugging information attached to it.

This happens when DebugSymbols is set to "None", and the output is in Release mode. The result is DebugInfo but it does not have a signature or other properties.

This addresses that particular scenario, by null checking the debug info as well as the signature before attempting to create the lookup dictionary.

System.Exception: Really bad explosion
   at MyCoolClassLibrary.AwesomeClass.ThrowsAnException()
   at Program.<Main>$(String[] args)
Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'key')
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey](IEnumerable`1 source, Func`2 keySelector, IEqualityComparer`1 comparer)
   at Mindscape.Raygun4Net.RaygunErrorMessageBuilder.GetDebugInfoForStackFrames(IEnumerable`1 frames) in C:\BuildAgent\work\75116afedfe31196\Mindscape.Raygun4Net.NetCore.Common\Builders\RaygunErrorMessageBuilder.cs:line 233
   at Mindscape.Raygun4Net.RaygunErrorMessageBuilder.Build(Exception exception) in C:\BuildAgent\work\75116afedfe31196\Mindscape.Raygun4Net.NetCore.Common\Builders\RaygunErrorMessageBuilder.cs:line 204
   at Mindscape.Raygun4Net.RaygunMessageBuilder.SetExceptionDetails(Exception exception) in C:\BuildAgent\work\75116afedfe31196\Mindscape.Raygun4Net.NetCore.Common\Builders\RaygunMessageBuilder.cs:line 54
   at Mindscape.Raygun4Net.RaygunClientBase.BuildMessage(Exception exception, IList`1 tags, IDictionary userCustomData, RaygunIdentifierMessage userInfo, Action`1 customiseMessage) in C:\BuildAgent\work\75116afedfe31196\Mindscape.Raygun4Net.NetCore.Common\RaygunClientBase.cs:line 427
   at Mindscape.Raygun4Net.RaygunClientBase.StripAndSend(Exception exception, IList`1 tags, IDictionary userCustomData, RaygunIdentifierMessage userInfo) in C:\BuildAgent\work\75116afedfe31196\Mindscape.Raygun4Net.NetCore.Common\RaygunClientBase.cs:line 454
   at Mindscape.Raygun4Net.RaygunClientBase.SendAsync(Exception exception, IList`1 tags, IDictionary userCustomData, RaygunIdentifierMessage userInfo) in C:\BuildAgent\work\75116afedfe31196\Mindscape.Raygun4Net.NetCore.Common\RaygunClientBase.cs:line 366
   at Mindscape.Raygun4Net.RaygunClientBase.Send(Exception exception, IList`1 tags, IDictionary userCustomData) in C:\BuildAgent\work\75116afedfe31196\Mindscape.Raygun4Net.NetCore.Common\RaygunClientBase.cs:line 322
   at Mindscape.Raygun4Net.RaygunClientBase.Send(Exception exception) in C:\BuildAgent\work\75116afedfe31196\Mindscape.Raygun4Net.NetCore.Common\RaygunClientBase.cs:line 295
   at Program.<Main>$(String[] args)
   at Program.<Main>(String[] args)

[phillip-haydon]

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