Checks if rol id exists. Fixes #3

event.py

@@ -18,29 +18,34 @@ class Event():
         self.participants = list()
         self.leaders = list()
         self.number_of_guests = 0
+        self.event_with_registration = False
 
-        sql = f"""SELECT mem_usr_id, mem_leader, mem_count_guests, mem_approved
+        if self.rol_id:
+            # Admidio only assigns a rol id when you can register for it
+            self.event_with_registration = True
+
+            sql = f"""SELECT mem_usr_id, mem_leader, mem_count_guests, mem_approved
                   FROM {self.admidio.prefix}_members
                   WHERE mem_rol_id = {self.rol_id}
                   AND mem_end = '9999-12-31'"""
-        self.__c.execute(sql)
-
-        for row in self.__c.fetchall():
-            try:
-                self.number_of_guests += row[2]
-
-                # Distinguish between members that will attend, not
-                # attend, or will maybe attend.
-                if row[1] == 1:
-                    self.leaders.append(
-                        [row[3], self.admidio.getMemberFromID(row[0])])
-                else:
-                    self.participants.append(
-                        [row[3], self.admidio.getMemberFromID(row[0])])
-
-            except MemberNotFoundException:
-                print(
-                    f"Member with id {row[0]} not found, group id: {self.id}")
+            self.__c.execute(sql)
+
+            for row in self.__c.fetchall():
+                try:
+                    self.number_of_guests += row[2]
+
+                    # Distinguish between members that will attend, not
+                    # attend, or will maybe attend.
+                    if row[1] == 1:
+                        self.leaders.append(
+                            [row[3], self.admidio.getMemberFromID(row[0])])
+                    else:
+                        self.participants.append(
+                            [row[3], self.admidio.getMemberFromID(row[0])])
+
+                except MemberNotFoundException:
+                    print(
+                        f"Member with id {row[0]} not found, group id: {self.id}")
 
     def getAllMembers(self):
         """Return leaders and members in group, combined"""