Fix #3227: Only call NewLine() in case no property initializer is present.

ICSharpCode.Decompiler/CSharp/OutputVisitor/CSharpOutputVisitor.cs

@@ -2694,7 +2694,11 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 					propertyDeclaration.Initializer.AcceptVisitor(this);
 					Semicolon();
 				}
-				NewLine();
+				else
+				{
+					// The call to Semicolon() above prints a newline too
+					NewLine();
+				}
 			}
 			else
 			{