Referee complaining when we don't change cells in a turn

[Ten0]

When output for a turn is a single new line, this error message triggers :

A-Star-Craft/src/main/java/com/codingame/game/Referee.java

Line 135 in 521cda9

summaries.add("Element amount in the action sequence is not a multiple of 3");

Though 0%3==0.