Add _mount_from_harvester abstract method

Not use if I should i it here. but that will prevent key error in other  SC Class

mxcubecore/HardwareObjects/EMBLFlexHCD.py

@@ -189,7 +189,7 @@ def init(self):
         self._update_selection()
         self.state = self._read_state()
 
-    def mount_from_harvester(self):
+    def _mount_from_harvester(self):
         return self._harvester and self._harvester_hwo
 
 

mxcubecore/HardwareObjects/Harvester.py

@@ -3,9 +3,10 @@
 
 [Description]
 Harvester is use as a replacement of the Dewar sample storage
-This hardware object is use in couple with a Sample changer .
-and it is compatible with the Crystal Direct Harvester 3.
-It has some functionalities, like Harvest Sample, .
+This hardware object is use in couple with a Sample changer.
+Sample changer load the sample from Harvester instead of dewar.
+It is compatible with the Crystal Direct Harvester 3.
+It has some functionalities, like Harvest Sample, etc....
 
 [Commands]
 
@@ -15,7 +16,7 @@
         <username>harvester</username>
         <exporter_address>wid30harvest:9001</exporter_address>
     </equipment>
--------------------------------------------------------------------
+-----------------------------------------------------------------
 """
 import gevent
 import logging
@@ -35,11 +36,11 @@ class HarvesterState:
     Running = 4
     Harvesting = 5
     ContinueHarvesting = 6
-    # Disabled = 6
-    # Running = 5
-    # StandBy = 6
-    # Alarm = 7
-    # Fault = 8
+    # Disabled = 7
+    # Running = 8
+    # StandBy = 9
+    # Alarm = 10
+    # Fault = 11
 
 
     STATE_DESC = {
@@ -76,7 +77,6 @@ def __init__(self, name):
 
     def init(self):
         """ Init """
-        # self.centring_calibration_hobj = self.getObjectByRole("centring_calibration")
         self.exporter_addr = self.get_property("exporter_address")
         self.crims_upload_url = self.get_property("crims_upload_url")
 

mxcubecore/HardwareObjects/abstract/AbstractSampleChanger.py

@@ -715,6 +715,10 @@ def _do_unload(self, sample_slot=None):
     @abc.abstractmethod
     def _do_reset(self):
         return
+
+    @abc.abstractmethod
+    def _mount_from_harvester(self):
+        return
 
     # ########################    PROTECTED    #########################