Changed query which is used to obtain certain person target sets. Most joins are

now left joins, otherwise the query would drop all targets without assigned
sub-bookings.

app/PersonTarget.php

@@ -200,15 +200,15 @@ class PersonTarget extends Model
         $selection = DB::select('
             SELECT
                 p_t.*,
-                p_t.amount * i_o2.factor as target,
-                sum(i_o1.factor * s_b.amount) as actual
-            FROM sub_bookings s_b
-                INNER JOIN account_types a_t ON a_t.id = s_b.account_type_id
-                INNER JOIN account_classes a_c ON a_c.id = a_t.account_class_id
-                INNER JOIN i_o_types i_o1 ON i_o1.id = a_c.io_type_id
-                INNER JOIN person_targets p_t ON p_t.id = s_b.person_target_id
+                p_t.amount * i_o2.factor AS target,
+                IFNULL(SUM(i_o1.factor * s_b.amount), 0) AS actual
+            FROM person_targets p_t
                 INNER JOIN i_o_types i_o2 ON i_o2.id = p_t.io_type_id
-            GROUP BY s_b.person_target_id
+                LEFT JOIN sub_bookings s_b ON p_t.id = s_b.person_target_id
+                LEFT JOIN account_types a_t ON a_t.id = s_b.account_type_id
+                LEFT JOIN account_classes a_c ON a_c.id = a_t.account_class_id
+                LEFT JOIN i_o_types i_o1 ON i_o1.id = a_c.io_type_id
+            GROUP BY p_t.id
             HAVING ' . $having . ';');
 
         // Remove the unused columns 'target' and 'actual' from the query