daq: fixed bug in mount where if current sample was manual it had no tell address so could not be set as "unmounted" - even if it was unmounted already.

src/aare/daq/daq.py

@@ -875,7 +875,8 @@ class AareDAQ:
         self.__devs.tell.set_in_mount_position(True)
         previous_sample = self.__cfg.current_sample
         if target is None:
-            logger.debug(f"Unmounting sample: {previous_sample} (address: {previous_sample.tell_address()})")
+            if previous_sample is not None:
+                logger.debug(f"Unmounting sample: {previous_sample}")
             try:
                 self.__devs.tell.unmount(wait=True, timeout=60.0)
                 self.__cfg.current_sample = target
@@ -885,9 +886,9 @@ class AareDAQ:
             try:
                 #TODO: how to differentiate between mounting and unmounting fails
                 # during a typucal mount call as this is handled by Tell?
-                log_msg =  f"Mounting sample: {target} (address: {target.tell_address()})"
+                log_msg =  f"Mounting sample: {target}"
                 if previous_sample is not None:
-                    log_msg = (f"Unmounting sample: {previous_sample} (address: {previous_sample.tell_address()})\n "
+                    log_msg = (f"Unmounting sample: {previous_sample} \n "
                                 f"and {log_msg}")
                 logger.debug(log_msg)
                 value = self.__devs.tell.mount(address=target.tell_address(), force=True, auto_unmount=True, read_dm=False,