So quick example to prove the point here:
12:03:39.793 | Combat: damage drAspirin -> vicwolf 649.60 Weapon_Plasmagun_Basic_T2_Mk3 DMG_EMP|DMG_PRIMARY_WEAPON
Setup of the situation, we're both in jerry frigs. No debuffs or buffs active on me. Lets be generous here and assume that he was hitting my shield lowest resist of 27 to EM; this should give me a resist of 7.3% to EMP damage. This would mean his normal plasma gun ('hail' is sniper and rapid is autofire) would have to be doing about 700 a shot base damage. Now I don't have the best gear possible to optimize damage but I know that this isn't possible with the normal plasma gun even from a frigate, even with a fighter giving him the damage buff.
So no, the white damage does not display in the combat log differently. It is however doing MUCH more damage than it should be considering resists.
Comparitively, this is damage I received that did not display as white in game:
12:03:42.508 | Combat: damage drAspirin -> vicwolf 573.75 Weapon_Plasmagun_Basic_T2_Mk3 DMG_KINETIC|DMG_PRIMARY_WEAPON
Now, my hull has even lower kinetic resists than my shields have EM resist (15 vs 27 respectively). If you see an error in my math here please point it out, the point being that you should be able to see that damage I am reporting as white is significantly higher than resists indicate that it should be. I will try to get better documentation of this but it is a very serious and very gamebreaking issue right now.