Merge pull request #2620 from devitocodes/gpu-detect-empty

arch: fix json erro with no card

Author: FabioLuporini

devito/arch/archinfo.py

@@ -328,7 +328,7 @@ def cbk(deviceid=0):
 
         return gpu_info
 
-    except OSError:
+    except (json.JSONDecodeError, OSError):
         pass
 
     # *** Third try: `sycl-ls`, clearly only works with Intel cards