scss-compiler: use non-zero exit code on Exception (#5287)

redaxo/src/addons/be_style/lib/scss_compiler.php

@@ -100,7 +100,7 @@ public function compile()
         } catch (Exception $e) {
             // here we could put the exception message, but who cares ...
             echo $e->getMessage();
-            exit();
+            exit(1);
         }
     }
 }