STNG-165 Improve unit test error logging, on Selenium testing (#188)

spring-boot/src/test/java/org/dcsa/conformance/frontend/SeleniumTestBase.java

@@ -3,6 +3,7 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
 import static org.junit.jupiter.api.Assumptions.assumeFalse;
 
 import java.time.Duration;
@@ -106,6 +107,7 @@ void runScenarioGroups() {
         log.info("Stopping after first scenario group");
         break;
       }
+      log.info("Finished scenario group {}.", i + 1);
     }
   }
 
@@ -125,6 +127,10 @@ private boolean handleJsonPromptForText() {
       promptText = fetchTransportDocument(promptText);
     }
 
+    if (driver.findElements(By.id("actionInput")).isEmpty()) {
+      log.error("Error: No actionInput element found, while a jsonForPromptText was displayed!");
+      fail();
+    }
     driver.findElement(By.id("actionInput")).sendKeys(promptText);
     driver.findElement(By.id("submitActionButton")).click();
     waitForUIReadiness();