iop parsing: make the PictureObject data size check less restricitve

I came across an implement (Kverneland Andex1304) which contains a
PictureGraphics with 0x0 actual size and 0 raw data size.
Later it contains the same PictureGraphics object with correct
dimensions, but the parser bailed out on the first zero size.

isobus/src/isobus_virtual_terminal_working_set_base.cpp

@@ -2294,9 +2294,7 @@ namespace isobus
 									CANStackLogger::warn("[WS]: Skipped parsing macro reference in picture graphic object (todo)");
 								}
 
-								if ((0 != tempObject->get_actual_width()) &&
-								    (0 != tempObject->get_actual_height()) &&
-								    (tempObject->get_raw_data().size() == (tempObject->get_actual_width() * tempObject->get_actual_height())))
+								if (tempObject->get_raw_data().size() != (tempObject->get_actual_width() * tempObject->get_actual_height()))
 								{
 									retVal = true;
 								}