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2551b736 - Fix bug in ControlNetPipelines with MultiControlNetModel of length 1 (#4032)

Fix bug in ControlNetPipelines with MultiControlNetModel of length 1 (#4032) * Fix bug in ControlNetPipelines with MultiControlNetModel of length 1 * Add tests for varying number of ControlNet models * Fix missing indexing for control_guidance_start and control_guidance_end * Fix code quality * Separate test for MultiControlNet with one model * Revert formatting of earlier test