it is possible to change or submit results for Generic and Cucumber Tests that are in non executable status

How to reproduce:

• configured the Test's workflow status "open" in "Disallow executions of Tests with workflow statuses",
• create a Test Execution and add a generic and a cucumber test
• submit results for the generic and for the cucumber test, using the REST API using the /rest/raven/1.0/import/execution endpoint
• test results are changed; it should return an error message such as "The Test YYYY-xxx is in a non-executable status"

curl -H "Content-Type: application/json" -X POST -u admin:admin --data @manual_result.json http://xray-tst-postgres-v7/rest/raven/1.0/import/execution
The Test WOOD-139 is in a non-executable status

curl -H "Content-Type: application/json" -X POST -u admin:admin --data @cucumber_result.json http://xray-tst-postgres-v7/rest/raven/1.0/import/execution

curl -H "Content-Type: application/json" -X POST -u admin:admin --data @generic_result.json http://xray-tst-postgres-v7/rest/raven/1.0/import/execution
{"testExecIssue":{"id":"47889","key":"WOOD-93","self":"http://xray-tst-postgres-v7/rest/api/2/issue/47889"}}

Sample scripts attached.

Endpoints that import/change results should validate this, including:

• all the ones mentioned here: https://confluence.xpand-addons.com/display/XRAY/Import+Execution+Results+-+REST
• all the PUT, POST and DELETE related endpoints of main Test Runs /rest/raven/1.0/api/testrun/ endpoint (see https://confluence.xpand-addons.com/display/XRAY/Test+Runs+-+REST)