Merge branch 'hotfix/0.9.3'

Author: pvandervelde

src/nbuildkit/actions/build/build.test.unit.mstest.msbuild

@@ -21,6 +21,7 @@
         Project="$(FileImports)" />
 
     <Target
+        Condition=" '@(UnitTestAssemblies)' != '' "
         Name="nBuildKit_Build_Test_Unit_MsTest_Run">
         <CallTarget Targets="_nBuildKit_Build_Test_Unit_MsTest_GetToolPaths" />
         <CallTarget Targets="_nBuildKit_Build_Test_Unit_MsTest_ReplaceBuildTemplates" />

src/nbuildkit/actions/build/build.test.unit.nunit.msbuild

@@ -21,6 +21,7 @@
         Project="$(FileImports)" />
 
     <Target
+        Condition=" '@(UnitTestAssemblies)' != '' "
         Name="nBuildKit_Build_Test_Unit_NUnit_Run">
         <CallTarget Targets="_nBuildKit_Build_Test_Unit_NUnit_GetToolPaths" />
         <CallTarget Targets="_nBuildKit_Build_Test_Unit_NUnit_ReplaceBuildTemplates" />

src/nbuildkit/actions/build/build.test.unit.vstest.msbuild

@@ -23,6 +23,7 @@
     </PropertyGroup>
 
     <Target
+        Condition=" '@(UnitTestAssemblies)' != '' "
         Name="nBuildKit_Build_Test_Unit_VsTest_Run">
         <CallTarget Targets="_nBuildKit_Build_Test_Unit_VsTest_GetToolPaths" />
         <CallTarget Targets="_nBuildKit_Build_Test_Unit_VsTest_ReplaceBuildTemplates" />

src/nbuildkit/actions/shared.bootstrap.generate.targetsfile.msbuild

@@ -29,6 +29,7 @@
     </Target>
 
     <Target
+        Condition=" '@(ExtensionAssemblies)' != '' "
         Name="_nBuildKit_Shared_Bootstrap_Generate_TargetsFile_Execute"
         Outputs="%(ExtensionAssemblies.Identity)">
         <Error