more nvidia capabilities safety (#2509)

ErsatzTV.FFmpeg/Capabilities/HardwareCapabilitiesFactory.cs

@@ -122,6 +122,8 @@ public class HardwareCapabilitiesFactory : IHardwareCapabilitiesFactory
             return string.Empty;
         }
 
+        try
+        {
             Option<List<CudaDevice>> maybeDevices = CudaHelper.GetDevices();
             foreach (List<CudaDevice> devices in maybeDevices.Where(list => list.Count > 0))
             {
@@ -137,6 +139,11 @@ public class HardwareCapabilitiesFactory : IHardwareCapabilitiesFactory
 
                 return sb.ToString();
             }
+        }
+        catch (FileNotFoundException)
+        {
+            // do nothing
+        }
 
         // if we don't have a list of cuda devices, fall back to ffmpeg check
 
@@ -522,6 +529,8 @@ public class HardwareCapabilitiesFactory : IHardwareCapabilitiesFactory
             return new NvidiaHardwareCapabilities(cudaDevice, ffmpegCapabilities, _logger);
         }
 
+        try
+        {
             Option<List<CudaDevice>> maybeDevices = CudaHelper.GetDevices();
             foreach (CudaDevice firstDevice in maybeDevices.Map(list => list.HeadOrNone()))
             {
@@ -534,6 +543,11 @@ public class HardwareCapabilitiesFactory : IHardwareCapabilitiesFactory
                 _memoryCache.Set(CudaDeviceKey, firstDevice);
                 return new NvidiaHardwareCapabilities(firstDevice, ffmpegCapabilities, _logger);
             }
+        }
+        catch (FileNotFoundException)
+        {
+            // do nothing
+        }
 
         _logger.LogWarning(
             "Error detecting NVIDIA GPU capabilities; some hardware accelerated features will be unavailable");