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streamext: add empty string in non-multi empty lines
Before 2.2.0, we only accepted input arguments in the form key=value. To support the new wwwauth[] argument from Git, we added support for these multi-value args key[]=value. In changing from an dictionary of string:string to string:list<string> we accidentally changed the behaviour of dictionary parsing in the case that an empty valued argument was provided. For example: username=\n Preivously this was returned as an empty string. Post 2.2.0 this became `null`, causing an error in scenarios were before there was none. One such scenario is with Windows Integrated Authentication (for example when connecting to Azure DevOps Server/TFS instances), whereby we return an empty username and password to Git to signal this auth mode. Git then returns to us the empty username and password in a `store` call. Update the handling in `ParseMultiLine` to restore the previous behaviour for empty-valued arguments being mapped to the empty string.
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