#190 Mandatory finished deadline

* adds template message to indicate a finished-deadline is mandatory
* adds finished deadline existance to quality check of compensation-like entries
* adds proper warning to quality check result
* extends tests

compensation/utils/quality.py

@@ -19,6 +19,7 @@ class CompensationQualityChecker(AbstractQualityChecker):
         self._check_states()
         self._check_actions()
         self._check_geometry()
+        self._check_deadlines()
         self.valid = len(self.messages) == 0
 
     def _check_states(self):
@@ -47,6 +48,16 @@ class CompensationQualityChecker(AbstractQualityChecker):
         if not self.obj.actions.all():
             self._add_missing_attr_name(_con("Compensation", "Actions"))
 
+    def _check_deadlines(self):
+        """ Checks data quality for related Deadline objects
+
+        Returns:
+
+        """
+        finished_deadlines = self.obj.get_finished_deadlines()
+        if not finished_deadlines.exists():
+            self._add_missing_attr_name(_("Finished deadlines"))
+
 
 class EcoAccountQualityChecker(CompensationQualityChecker):
     def run_check(self):