Find Test Cases which do not contain an Assertion

The following Groovy script can be added to you TestSuite Setup Script:  

// Loop through each test case and all of their test steps within the test suite.
// NOTE: getTestSteps() and getTestCases() return Maps with the name as the key and the actual case/step as the value.
testSuite.getTestCases().each() { teatCaseName, testCase ->
	testCase.getTestSteps().each() { testStepName, testStep  ->
		// Check to see if current step implements the interface Assertable
		if (testStep in com.eviware.soapui.model.testsuite.Assertable){ 
			def assertionCount = testStep.getAssertionCount() 
			if(!assertionCount){
				log.warn('The test step "' + testStep.getName() + '" in the test case "' + testCase.getName() + '" does not have any assertions!')
			}
		}
	}	
}

This will loop through all of your test cases and their test steps before the test suite is run, logging a warning message when it finds one without an assertion. This could easily be tweaked to do what you want.

Note: If you add this to your test suite Setup Script it will run every time you run your test suite, you will have to decide if this has a significant performance impact or not.

Edit: I see that conversation has occured as I was typing out a reply, and now there is a bit more information. you should be able to move the above script to the Project startup script, and then an add a test suite loop.