DocumentFormatException: Expected name as dictionary key, instead got: Collaborative

[kirk-marple]

Found a file, which throws a DocumentFormatException. Found it in some sample documents, and it's known to cause issues, but thought it may be useful to fix since I have lenient parsing enabled.

Got the error:
Expected name as dictionary key, instead got: Collaborative

Using Nuget:

Here's the file which doesn't open correctly:
invalid-pdf-structure-pdfminer-entire-doc.pdf

UglyToad.PdfPig.Core.PdfDocumentFormatException:
   at UglyToad.PdfPig.Tokenization.DictionaryTokenizer.ConvertToDictionary (UglyToad.PdfPig.Tokenization, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Tokenization.DictionaryTokenizer.TryTokenizeInternal (UglyToad.PdfPig.Tokenization, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Tokenization.DictionaryTokenizer.TryTokenize (UglyToad.PdfPig.Tokenization, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Tokenization.Scanner.CoreTokenScanner.MoveNext (UglyToad.PdfPig.Tokenization, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Tokenization.Scanner.PdfTokenScanner.MoveNext (UglyToad.PdfPig, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Tokenization.Scanner.PdfTokenScanner.Get (UglyToad.PdfPig, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Parser.Parts.DirectObjectFinder.Get (UglyToad.PdfPig, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Parser.DocumentInformationFactory.Create (UglyToad.PdfPig, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Parser.PdfDocumentFactory.OpenDocument (UglyToad.PdfPig, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Parser.PdfDocumentFactory.Open (UglyToad.PdfPig, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.Parser.PdfDocumentFactory.Open (UglyToad.PdfPig, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)
   at UglyToad.PdfPig.PdfDocument.Open (UglyToad.PdfPig, Version=0.1.9.0, Culture=neutral, PublicKeyToken=605d367334e74123)

[BobLd]

@kirk-marple thanks a lot for providing the sample pdf - the fix PR is created. Allows to not throw exception when lenient parsing is enabled