Prevent crash when trying to navigate to a badly formed URL.
Prevent crash when trying to navigate to a badly formed URL.

Microsoft/PTVS,Microsoft/PTVS,zooba/PTVS,huguesv/PTVS,zooba/PTVS,Microsoft/PTVS,zooba/PTVS,Microsoft/PTVS,int19h/PTVS,zooba/PTVS,huguesv/PTVS,int19h/PTVS,int19h/PTVS,huguesv/PTVS,int19h/PTVS,int19h/PTVS,zooba/PTVS,Microsoft/PTVS,huguesv/PTVS,huguesv/PTVS,int19h/PTVS,zooba/PTVS,huguesv/PTVS,Microsoft/PTVS