handle "PROBLEMS" HAFAS error code

Author: derhuerst

lib/errors.js

@@ -109,6 +109,13 @@ const byErrorCode = Object.assign(Object.create(null), {
 			shouldRetry: true,
 		},
 	},
+	PROBLEMS: {
+		Error: HafasServerError,
+		message: 'an unknown problem occured during search',
+		props: {
+			shouldRetry: true,
+		},
+	},
 	LOCATION: {
 		Error: HafasNotFoundError,
 		message: 'location/stop not found',