Added ability to move an existing customer into a vacant unit. Changed out all of the 'amount' fields with 'rent', since it's much more self-explanatory. We still need the ability to add customers and contacts. I'll consider doing this by using the insert row ability of jqGrid.

git-svn-id: file:///svn-source/pmgr/branches/invoice_receipt_20090629@204 97e9348a-65ac-dc4b-aefc-98561f571b83

site/models/ledger.php

@@ -209,7 +209,13 @@ class Ledger extends AppModel {
 
     // The fields are all tucked into the [0] index,
     // and the rest of the array is useless (empty).
-    return $stats[0];
+    $stats = $stats[0];
+
+    // Make sure we have a non-null balance
+    if (!isset($stats['balance']))
+      $stats['balance'] = 0;
+
+    return $stats;
   }
 
 }