test: Add assert for non blank modelName

src/test/java/no/nibio/vips/model/psilarosaetempmodel/PsilaRosaeTempModelTest.java

@@ -115,6 +115,7 @@ public class PsilaRosaeTempModelTest {
         PsilaRosaeTempModel instance = new PsilaRosaeTempModel();
         String result = instance.getModelName();
         assertNotNull(result);
+        assertTrue(!result.isBlank());
     }
 
     /**