fixed an issue where workspace folders could be null, and this would cause issues

[david-driscoll]

fixes #345

[codecov]

Codecov Report

Merging #346 into master will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
- Coverage   75.37%   75.35%   -0.03%     
==========================================
  Files         441      441              
  Lines       12741    12742       +1     
  Branches     1180     1180              
==========================================
- Hits         9604     9602       -2     
- Misses       3137     3140       +3     

Impacted Files	Coverage Δ
src/Server/LanguageServerWorkspaceFolderManager.cs	93.54% <100.00%> (+0.10%)	⬆️
src/Protocol/Models/WorkspaceFolder.cs	73.68% <0.00%> (-10.53%)	⬇️
...rc/Client/LanguageClientWorkspaceFoldersManager.cs	94.73% <0.00%> (-1.76%)	⬇️

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