OP-3908 - added missed xml help

Added optionality to validator as

openpype/hosts/photoshop/plugins/publish/help/validate_instance_asset.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<root>
+<error id="main">
+<title>Asset does not match</title>
+<description>
+## Collected asset name is not same as in context
+
+    {msg}
+### How to repair?
+    {repair_msg}
+    If that's not correct value, close workfile and reopen via Workfiles to get
+    proper context asset name OR disable this validator and publish again
+    if you are publishing to different context deliberately.
+
+    (Context means combination of project, asset name and task name.)
+</description>
+</error>
+</root>

openpype/hosts/photoshop/plugins/publish/validate_instance_asset.py

@@ -1,7 +1,11 @@
 import pyblish.api
 
 from openpype.pipeline import legacy_io
-from openpype.pipeline.publish import ValidateContentsOrder
+from openpype.pipeline.publish import (
+    ValidateContentsOrder,
+    PublishXmlValidationError,
+    OptionalPyblishPluginMixin
+)
 from openpype.hosts.photoshop import api as photoshop
 
 
@@ -31,30 +35,38 @@ class ValidateInstanceAssetRepair(pyblish.api.Action):
             stub.imprint(instance[0], data)
 
 
-class ValidateInstanceAsset(pyblish.api.InstancePlugin):
+class ValidateInstanceAsset(OptionalPyblishPluginMixin,
+                            pyblish.api.InstancePlugin):
     """Validate the instance asset is the current selected context asset.
 
-        As it might happen that multiple worfiles are opened, switching
-        between them would mess with selected context.
-        In that case outputs might be output under wrong asset!
+    As it might happen that multiple worfiles are opened, switching
+    between them would mess with selected context.
+    In that case outputs might be output under wrong asset!
 
-        Repair action will use Context asset value (from Workfiles or Launcher)
-        Closing and reopening with Workfiles will refresh  Context value.
+    Repair action will use Context asset value (from Workfiles or Launcher)
+    Closing and reopening with Workfiles will refresh  Context value.
     """
 
     label = "Validate Instance Asset"
     hosts = ["photoshop"]
+    optional = True
     actions = [ValidateInstanceAssetRepair]
     order = ValidateContentsOrder
 
     def process(self, instance):
         instance_asset = instance.data["asset"]
         current_asset = legacy_io.Session["AVALON_ASSET"]
-        msg = (
-            f"Instance asset {instance_asset} is not the same "
-            f"as current context {current_asset}. PLEASE DO:\n"
-            f"Repair with 'A' action to use '{current_asset}'.\n"
-            f"If that's not correct value, close workfile and "
-            f"reopen via Workfiles!"
-        )
-        assert instance_asset == current_asset, msg
+
+        if instance_asset != current_asset:
+            msg = (
+                f"Instance asset {instance_asset} is not the same "
+                f"as current context {current_asset}."
+
+            )
+            repair_msg = (
+                f"Repair with 'Repair' button to use '{current_asset}'.\n"
+            )
+            formatting_data = {"msg": msg,
+                               "repair_msg": repair_msg}
+            raise PublishXmlValidationError(self, msg,
+                                            formatting_data=formatting_data)