Bug: AttributeError in TangentialCFG.is_conditional and NameError in FrequencyDecoupledGuidance.forward

[Ricardo-M-L]

Describe the bug

Two crash bugs in the guiders:

1. TangentialCFG.is_conditional (in src/diffusers/guiders/tangential_classifier_free_guidance.py) references self._num_outputs_prepared, which does not exist on the class - the actual attribute is self._count_prepared. Any call raises AttributeError.

2. FrequencyDecoupledGuidance.forward (in src/diffusers/guiders/frequency_decoupled_guidance.py) references the undefined name pred_cond_freq in the non-FDG branch - should be pred_cond_pyramid[level]. Any run with that branch raises NameError.

Expected behavior

• TangentialCFG.is_conditional should return self._count_prepared == 1
• FrequencyDecoupledGuidance non-FDG branch should append pred_cond_pyramid[level]

Fix in PR #14512 (rebase of #13434).