fix: Add signature only if not Communication.flags.skip_add_signature

This is added to handle purposely removed signature or custom signatures
added via the Email Composer or via the email.make API

frappe/core/doctype/communication/communication.py

@@ -150,7 +150,8 @@ class Communication(Document, CommunicationEmailMixin):
 			self.content = f'{self.content}</p><br><p class="signature">{signature}'
 
 	def before_save(self):
-		self.set_signature_in_email_content()
+		if not self.flags.skip_add_signature:
+			self.set_signature_in_email_content()
 
 	def on_update(self):
 		# add to _comment property of the doctype, so it shows up in

frappe/core/doctype/communication/email.py

@@ -147,7 +147,9 @@ def _make(
 		"read_receipt":read_receipt,
 		"has_attachment": 1 if attachments else 0,
 		"communication_type": communication_type,
-	}).insert(ignore_permissions=True)
+	})
+	comm.flags.skip_add_signature = True
+	comm.insert(ignore_permissions=True)
 
 	# if not committed, delayed task doesn't find the communication
 	if attachments: