Fixed memory leak in plan serializer when loading external module.
Fixed memory leak in plan serializer when loading external module.

cezarfx/zorba,28msec/zorba,cezarfx/zorba,28msec/zorba,28msec/zorba,bgarrels/zorba,28msec/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,bgarrels/zorba,28msec/zorba,cezarfx/zorba,cezarfx/zorba,28msec/zorba,bgarrels/zorba,bgarrels/zorba,cezarfx/zorba,bgarrels/zorba,bgarrels/zorba,bgarrels/zorba,28msec/zorba,cezarfx/zorba,cezarfx/zorba,28msec/zorba,28msec/zorba,cezarfx/zorba