fix wrong check and revert accidental removal

Author: Ahrkylien

Source/SVGImage/DotNetProjects.SVGImage.csproj

@@ -29,6 +29,9 @@
 		<PackageIcon>images\dotnetprojects.png</PackageIcon>
 		<PackageTags>svg wpf svg-icons svg-to-png svg-to-xaml svgimage svgimage-control</PackageTags>
 		<PackageReadmeFile>Readme.md</PackageReadmeFile>
+		<EnablePackageValidation>true</EnablePackageValidation>
+		<!-- NOTE: Detect breaking changes from a previous version -->
+		<PackageValidationBaselineVersion>5.1.0</PackageValidationBaselineVersion>
 	</PropertyGroup>
 
 	<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">

Source/SVGImage/SVG/Shapes/Group.cs

@@ -111,8 +111,9 @@ private Shape AddToList(SVG svg, XmlNode childnode, Shape parent, bool isDefinit
 
             if (retVal != null)
             {
-                m_elements.Add(retVal);
-                if (retVal.Id.Length > 0 && !isDefinition)
+                if (!isDefinition)
+                    m_elements.Add(retVal);
+                if (retVal.Id.Length > 0)
                     svg.AddShape(retVal.Id, retVal);
             }