Fixed stderr error output

Signed-off-by: Dimitris Zlatanidis <d.zlatanidis@gmail.com>

slpkg/auto_pkg.py

@@ -61,8 +61,7 @@ class Auto:
         try:
             self.choice = input(" > ")
         except EOFError:
-            print()
-            raise SystemExit()
+            raise SystemExit("\n")
         if self.choice in self.commands.keys():
             print(f"   \x1b[1A{self.cyan}{self.commands[self.choice]}"
                   f"{self.endc}", end="\n\n")

slpkg/dialog_box.py

@@ -43,8 +43,8 @@ class DialogUtil:
     def imp_dialog(self):
         try:
             from dialog import Dialog
-        except ImportError:
-            raise SystemExit()
+        except ImportError as er:
+            raise SystemExit(er)
         self.d = Dialog(dialog="dialog", autowidgetsize=True)
 
     def checklist(self):

slpkg/upgrade_checklist.py

@@ -53,6 +53,6 @@ def choose_upg(packages):
             if name in packages:
                 selected_packages.append(name)
         if not selected_packages:
-            raise SystemExit()
+            raise SystemExit(1)
         print()
     return selected_packages