PLMS edge-case handling fix 2

class StableDiffusionProcessingTxt2Img(StableDiffusionProcessing):

    sampler = None

    def __init__(self, enable_hr: bool = False, denoising_strength: float = 0.75, firstphase_width: int = 0, firstphase_height: int = 0, hr_scale: float = 2.0, hr_upscaler: str = None, hr_second_pass_steps: int = 0, hr_resize_x: int = 0, hr_resize_y: int = 0, hr_sampler: int = 0, **kwargs):

    def __init__(self, enable_hr: bool = False, denoising_strength: float = 0.75, firstphase_width: int = 0, firstphase_height: int = 0, hr_scale: float = 2.0, hr_upscaler: str = None, hr_second_pass_steps: int = 0, hr_resize_x: int = 0, hr_resize_y: int = 0, hr_sampler: int | str = 0, **kwargs):

        super().__init__(**kwargs)

        self.enable_hr = enable_hr

        self.denoising_strength = denoising_strength

        img2img_sampler_name = self.sampler_name if self.sampler_name != 'PLMS' else 'DDIM'  # PLMS does not support img2img so we just silently switch ot DDIM

        if self.hr_sampler != 0 and sd_samplers.samplers[self.hr_sampler].name != 'PLMS':

        if self.hr_sampler == 0:

            pass

        elif self.hr_sampler == 'PLMS':

            img2img_sampler_name = 'DDIM'

        else:

            img2img_sampler_name = self.hr_sampler

        self.sampler = sd_samplers.create_sampler(img2img_sampler_name, self.sd_model)