Code: Rescue from NullReferenceException.
Fixes: #1434.
Merge pull request #1427 from DotNetSparky/nullfix

Fix NullReferenceException error during build when looking for CompileOnBuild settings.
HTML: Fixed type ambiguity issue in CI builds
Sprite: Adds margin functionality with setting.
Fixes #1446.
HTML: Fixed type ambiguity issue in CI builds
Merge pull request #1451 from am11/master

Sprite: Adds margin functionality with setting
Bundle: Add file when it doesn't exists. (#1384)
Undo 5d96aba.
Merge pull request #1453 from am11/master

Bundle: Add file when it doesn't exists (#1384)
Suppress first-chance exception on initial load
Fix C# embedding in Markdown editor
Speed up slow pre-build task

xregexp does not have any executables, so it was
always installing & re-packing everything.
Fix Markdown compilation & test
Fix incorrect assumptions in LESS compilation test
Merge pull request #1455 from SLaks/misc-fixes

Misc fixes
Detection of version number of VSIX by using VS ExtensionManager passing ProductID as argument
Removed HintPath and line break

HintPath was removed from the reference for Microsoft.VisualStudio.ExtensionManager and line break from end of csproj
Merge pull request #1450 from jerriclynsjohn/detect-version-of-vsix

Detecting version number of VSIX
Fixed reference
References: Resolves warning issue.
Doc: Fix spelling errors.