fixes #1930 PathMarkupParser ends figure always

src/Avalonia.Visuals/Media/PathMarkupParser.cs

@@ -107,7 +107,7 @@ namespace Avalonia.Media
             {
                 if(!ReadCommand(ref span, out var command, out var relative))
                 {
-                    return;
+                    break;
                 }
 
                 bool initialCommand = true;
@@ -565,4 +565,4 @@ namespace Avalonia.Media
             return true;
         }
     }
-}
+}