Ensure date is not null when reading from database

Added an check for NULL when getting a date value from the database. This ensures that NULL values aren't being returned as Jan 1, 1970.

Author: dansterrett

lib/sqlite3db.js

@@ -423,7 +423,7 @@ SQLiteDB.prototype.fromDatabase = function (model, data) {
       } else {
         json[p] = val;
       }
-    } else if (prop && type === 'Date'){
+    } else if (prop && (type === 'Date') && (val !== null)) {
       json[p] = new Date(val);
     } else {
       json[p] = val;