[IMP] base_report_to_printer: out of connection fallback to client

If the CUPS server isn't available the user won't be able to do anything
to print the report they need.

At last we can give them the chance to have a fallback behavior
downloading the document.

TT47134

base_report_to_printer/models/ir_actions_report.py

@@ -53,6 +53,10 @@ class IrActionsReport(models.Model):
             "action": result["action"],
             "printer_name": result["printer"].name,
         }
+        if result.get("printer_exception") and not self.env.context.get(
+            "skip_printer_exception"
+        ):
+            serializable_result["printer_exception"] = True
         return serializable_result
 
     def _get_user_default_print_behaviour(self):
@@ -97,6 +101,21 @@ class IrActionsReport(models.Model):
             # For some reason design takes report defaults over
             # False action entries so we must allow for that here
             result.update({k: v for k, v in print_action.behaviour().items() if v})
+        printer = result.get("printer")
+        if printer:
+            # When no printer is available we can fallback to the default behavior
+            # letting the user to manually print the reports.
+            try:
+                printer.server_id._open_connection(raise_on_error=True)
+                printer_exception = printer.status in [
+                    "error",
+                    "server-error",
+                    "unavailable",
+                ]
+            except Exception:
+                printer_exception = True
+            if printer_exception and not self.env.context.get("skip_printer_exception"):
+                result["printer_exception"] = True
         return result
 
     def print_document(self, record_ids, data=None):
@@ -140,7 +159,12 @@ class IrActionsReport(models.Model):
         """
         if self.env.context.get("must_skip_send_to_printer"):
             return False
-        if behaviour["action"] == "server" and printer and document:
+        if (
+            behaviour["action"] == "server"
+            and printer
+            and document
+            and not behaviour.get("printer_exception")
+        ):
             return True
         return False