[Build] Add version conditions

Author: Nice3point

Directory.Packages.props

@@ -9,11 +9,11 @@
 
     <ItemGroup>
         <!-- Revit Platform -->
-        <PackageVersion Include="Nice3point.Revit.Api.AdWindows" Version="$(RevitVersion).*"/>
-        <PackageVersion Include="Nice3point.Revit.Api.RevitAPI" Version="$(RevitVersion).*"/>
-        <PackageVersion Include="Nice3point.Revit.Api.RevitAPIUI" Version="$(RevitVersion).*"/>
-        <PackageVersion Include="Nice3point.Revit.Api.UIFramework" Version="$(RevitVersion).*"/>
-        <PackageVersion Include="Nice3point.Revit.Api.UIFrameworkServices" Version="$(RevitVersion).*"/>
+        <PackageVersion Include="Nice3point.Revit.Api.AdWindows" Version="$(RevitVersion).*" Condition="$(RevitVersion) != ''"/>
+        <PackageVersion Include="Nice3point.Revit.Api.RevitAPI" Version="$(RevitVersion).*" Condition="$(RevitVersion) != ''"/>
+        <PackageVersion Include="Nice3point.Revit.Api.RevitAPIUI" Version="$(RevitVersion).*" Condition="$(RevitVersion) != ''"/>
+        <PackageVersion Include="Nice3point.Revit.Api.UIFramework" Version="$(RevitVersion).*" Condition="$(RevitVersion) != ''"/>
+        <PackageVersion Include="Nice3point.Revit.Api.UIFrameworkServices" Version="$(RevitVersion).*" Condition="$(RevitVersion) != ''"/>
         <PackageVersion Include="Nice3point.TUnit.Revit" Version="$(RevitVersion).*" Condition="$(RevitVersion) != ''"/>
 
         <!-- Build Automation -->