fix(bug): add column has no def options

Signed-off-by: Tobias Gurtzick <[email protected]>

index.js

@@ -334,7 +334,7 @@ var Base = Class.extend({
 
   addColumn: function(tableName, columnName, columnSpec, callback) {
     var columnSpec = this.normalizeColumnSpec(columnSpec);
-    this._prepareSpec(columnName, columnSpec, columnDefOptions, tableName);
+    this._prepareSpec(columnName, columnSpec, {}, tableName);
     var def = this.createColumnDef(columnName, columnSpec, {}, tableName);
     var extensions = '';
     var self = this;