Do not abort if IO cannot be started or put into safe mode

ROMFS/px4fmu_common/init.d/rcS

@@ -198,8 +198,12 @@ then
 
 			tone_alarm MLL32CP8MB
 
-			px4io start
-			px4io safety_on
+			if px4io start
+			then
+				if px4io safety_on
+				then
+				fi
+			fi
 
 			if px4io forceupdate 14662 ${IO_FILE}
 			then