Fix offload detection with CPU only envs

modules/shared.py

@@ -89,6 +89,8 @@ devices.device = devices.get_optimal_device()
 mem_stat = memory_stats()
 cpu_memory = round(mem_stat['ram']['total'] if "ram" in mem_stat else 0)
 gpu_memory = round(mem_stat['gpu']['total'] if "gpu" in mem_stat else 0)
+if gpu_memory == 0:
+    gpu_memory = cpu_memory
 native = backend == Backend.DIFFUSERS
 if not files_cache.do_cache_folders:
     log.warning('File cache disabled: ')

modules/shared_defaults.py

@@ -10,7 +10,7 @@ def get_default_modes(cmd_opts, mem_stat):
     default_diffusers_offload_never = ''
     gpu_memory = round(mem_stat['gpu']['total'] if "gpu" in mem_stat else 0)
     if not (cmd_opts.lowvram or cmd_opts.medvram):
-        if "gpu" in mem_stat:
+        if "gpu" in mem_stat and gpu_memory != 0:
             if gpu_memory <= 4:
                 cmd_opts.lowvram = True
                 default_offload_mode = "sequential"