Description of problem:
When the condition set on a sequence flow cannot be parsed by the constraint editor then the whole stack trace will be present in the server log. This potentially presents a lot of waste in the log. Please consider outputting only an error message or changing the log level.

Steps to Reproduce:
1. Create a sequence flow condition which does not have the format of 'KieFunctions.functionName(variable, params)'
2. Switch to the constraint editor.
3. Take a look into the server log