Adapted the `test_filter_no_number_2` test

Now we expect an `error` not necesarily a `number`.

tests/test_plot/test_yaml_errors.py

@@ -296,7 +296,7 @@ def test_filter_no_number():
 def test_filter_no_number_2():
     ctx = context.TestContext('FilterNoNumber2', PRJ, 'error_filter_no_number_2', '')
     ctx.run(EXIT_BAD_CONFIG)
-    assert ctx.search_err("Missing .?number.?")
+    assert ctx.search_err("Missing .?error.?")
     ctx.clean_up()