Fixed: Prevent lack of internet from stopping all health checks from running

src/NzbDrone.Core/HealthCheck/Checks/SystemTimeCheck.cs

@@ -22,6 +22,8 @@ namespace NzbDrone.Core.HealthCheck.Checks
         }
 
         public override HealthCheck Check()
+        {
+            try
             {
                 var request = _cloudRequestBuilder.Create()
                     .Resource("/time")
@@ -37,6 +39,11 @@ namespace NzbDrone.Core.HealthCheck.Checks
                     _logger.Error("System time mismatch. SystemTime: {0} Expected Time: {1}. Update system time", systemTime, result.DateTimeUtc);
                     return new HealthCheck(GetType(), HealthCheckResult.Error, _localizationService.GetLocalizedString("SystemTimeHealthCheckMessage"), "#system-time-off");
                 }
+            }
+            catch (Exception e)
+            {
+                _logger.Warn(e, "Unable to verify system time");
+            }
 
             return new HealthCheck(GetType());
         }