Using the following content in the createvehicle.txt:
3 ""

Will not log the following script command executed on client side:
"I_Heli_light_03_F" createVehicle (player modelToWorld[0,10,0.1]);

The createvehicle.log will not list the command and neither will the a3master.log file, the only thing in the log will be:
14.04.2015 04:58:13: SINE (censored) censored - #0 "B_Parachute" 3:416 [0,0,0]
14.04.2015 04:58:13: SINE (censored) censored - #0 "B_Parachute" 3:417 [0,0,0]
14.04.2015 04:58:13: SINE (censored) censored - #0 "B_Parachute" 3:418 [0,0,0]
14.04.2015 04:58:13: SINE (censored) censored - #0 "B_Parachute" 3:419 [0,0,0]
14.04.2015 04:58:13: SINE (censored) censored - #0 "B_Parachute" 3:420 [0,0,0]
14.04.2015 04:58:13: SINE (censored) censored - #0 "B_Parachute" 3:421 [0,0,0]

The following commands will show up in the log properly, if executed, though:
"SmokeShellGreen" createVehicle (player modelToWorld[0,10,0.1]);
"B_MRAP_01_F" createVehicle (player modelToWorld[0,10,0.1]); {F26108} {F26109}