Fix #3713 Pop up Validation error doesn't show up for SLD (add default message) #3771
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Description
This PR add a default message in validation of Style Editor when the message doesn't contain information about the error.
Issues
Please check if the PR fulfills these requirements
What kind of change does this PR introduce? (check one with "x", remove the others)
What is the current behavior? (You can also link to an open issue here)
Some server doesn't return a parsable message of error
What is the new behavior?
add a default message in validation
Does this PR introduce a breaking change? (check one with "x", remove the other)
If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...
Other information: