The ornamental design for a rack for dishwashertrolley, as shown and described.
1. Rack for dishwasher trolley
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
1.8 : Reference
The broken lines shown in Figures 1.2-1.5 depict portions of the rack for dishwasher trolley that form no part of the claimed design. The portion of the design shown in the color grey in Figures 1.1 and 1.6-1.8 is for the purpose of illustrating portions of the rack for dishwasher trolley and forms no part of the claimed design.