Monteverdi: potentially non portable use of "defined"

Theses lines:

• https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/blob/develop/Modules/Visualization/Monteverdi/include/mvdMainWindow.h#L31
• https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/blob/develop/Modules/Visualization/Monteverdi/src/mvdMainWindow.cxx#L112
• https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/blob/develop/Modules/Visualization/Monteverdi/src/main.cxx#L40

in Monteverdi throw warnings with gcc 7:

warning: this use of "defined" may not be portable [-Wexpansion-to-defined]

But I don't understand... what does ( ( !defined( OTB_DEBUG ) && 0 ) || 0 ) mean ? Can I just replace it by 0 to fix the warning?