IS INITIAL for abap_bool and tables

[larshp]

IF lv_flag IS INITIAL.
IF lv_flag IS NOT INITIAL.
* ->
IF lv_flag = abap_false.
IF lv_flag = abap_true.

IF lt_table IS INITIAL.
IF lt_table IS NOT INITIAL.
* ->
IF lines( lt_table ) = 0.
IF lines( lt_table ) > 0.
*assuming there is no header line