Manage error when no Printers are found

src/printers.py

@@ -111,6 +111,11 @@ class Printers:
                 self.app.logger.debug("Found a %s printer" , manufacturer)
 
         self.app.logger.debug("Found %s printers" , len(printers))
+
+        if len(printers) < 1:
+            self.app.logger.warning("Not printers found ! Please plug in a Printer and restart the program.")
+            raise RuntimeError("No printers found")
+
         return printers
 
     def any(self) -> Printer:

src/worker.py

@@ -64,7 +64,7 @@ class PrintWorker(threading.Thread):
                         "Ready" if self.printer.ready else "Not ready",
                     )
                 except Exception as e:
-                    self.app.logger.error(str(e))
+                    self.app.logger.error("No printer detected" + str(e))
                     self.printer = None
 
             if self.state != "idle":