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Probably similar to attitude toward Native-Americans in PLC or attitude toward Chinese in Sweden :p
Other than some generic "those weird peoples from far away are prolly somewhat primitive" that all Europeans shared, blacks most likely would have been far too rare and exotic sight in Imperial Russia to actually warrant any serious racism.
 
AFAIK it was all see more in religious terms than racial ones. Ethiopia and Ethiopians were seen very positively and there are some interesting accounts of Russian officers as observers/attaches aiding the Ethiopians against the Italians and others in the late 19th century. Muslim blacks were of course the enemy. Everyone else was too remote to be of interest. There were no 'color' boundaries in their society.