Exceptions: added an UnmountingFailed exception

src/aare/common/exception_handler.py

@@ -27,6 +27,16 @@ class LoopCenteringFailed(Exception):
         return self.message
 
 
+class UnmountingFailed(Exception):
+    def __init__(self, message: str = "A sample was not unmounted"):
+        super().__init__(message)
+        self.message = message
+        logger.error(message, extra={"exception:": Exception})
+
+    def __str__(self) -> str:
+        return self.message
+
+
 class MountingFailed(Exception):
     def __init__(self, message: str = "A sample was not mounted"):
         super().__init__(message)