Rule Definition
An empty IF-ENDIF block defeats the purpose of error management or, more generally, pollutes the code with a piece of code that does nothing. Regarding error handling, when a function or an Open SQL query reports a problem via the SY-SUBRC, nothing happens and the program may dysfunction. Moreover, these empty IF-ENDIF blocks may not be detected easily.

Remediation
Insert statements in all IF blocks to manage the situation properly.

Violation Code Sample

READ TABLE P_EVENTS WITH KEY NAME = SLIS_EV
                           INTO LS_EVENT.
IF SY-SUBRC = 0
ENDIF.
...
MOVE TOP_OF_PAGE TO LS_EVENT-FORM.

Fixed Code Sample

READ TABLE P_EVENTS WITH KEY NAME = SLIS_EV
                           INTO LS_EVENT.
IF SY-SUBRC = 0.
    MOVE TOP_OF_PAGE TO LS_EVENT-FORM.
ENDIF.