Add newline to empty <TargetExt> elements in VC 2010 C++ projects

src/actions/vstudio/vs2010_vcxproj.lua

@@ -1048,7 +1048,13 @@
 
 
 	function vc2010.targetExt(cfg)
-		_x(2,'<TargetExt>%s</TargetExt>', cfg.buildtarget.extension)
+		local ext = cfg.buildtarget.extension
+		if ext ~= "" then
+			_x(2,'<TargetExt>%s</TargetExt>', ext)
+		else
+			_p(2,'<TargetExt>')
+			_p(2,'</TargetExt>')
+		end
 	end
 
 

tests/actions/vstudio/vc2010/test_output_props.lua

@@ -193,3 +193,23 @@
 		<GenerateManifest>false</GenerateManifest>
 		]]
 	end
+
+
+---
+-- The <TargetExt> should be split if there is no extension.
+---
+
+	function suite.splitTargetExt_onNoTargetExtension()
+		targetextension ""
+		prepare()
+		test.capture [[
+	<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+		<LinkIncremental>true</LinkIncremental>
+		<OutDir>.\</OutDir>
+		<IntDir>obj\Debug\</IntDir>
+		<TargetName>MyProject</TargetName>
+		<TargetExt>
+		</TargetExt>
+	</PropertyGroup>
+		]]
+	end