add try block and fix linting

Signed-off-by: ignaciosica <[email protected]>

Author: ignaciosica

vllm/platforms/cpu.py

@@ -76,12 +76,14 @@ def supported_dtypes(self) -> list[torch.dtype]:
         if self.get_cpu_architecture() == CpuArchEnum.POWERPC:
             return [torch.bfloat16, torch.float32]
         elif (self.get_cpu_architecture() == CpuArchEnum.ARM
-            and sys.platform.startswith("darwin")):
-            if (subprocess.check_output(
-                    ["sysctl", "-n", "-e", "hw.optional.arm.FEAT_BF16"]
-                ).strip() == b"1"):
-                return [torch.bfloat16, torch.float16, torch.float32]
-            return [torch.float16, torch.float32]
+              and sys.platform.startswith("darwin")):
+            try:
+                if (subprocess.check_output(
+                    ["sysctl", "-n", "-i",
+                     "hw.optional.arm.FEAT_BF16"]).strip() == b"1"):
+                    return [torch.bfloat16, torch.float16, torch.float32]
+            except Exception:
+                return [torch.float16, torch.float32]
         # x86/aarch64 CPU has supported both bf16 and fp16 natively.
         return [torch.bfloat16, torch.float16, torch.float32]