[arch] fix: missing error handling when hard requirements for optional dependencies cannot be found by pacman

CHANGELOG.md

@@ -10,6 +10,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - allowing AUR packages to be installed when bauh is launched by the root user [#196](https://github.com/vinifmor/bauh/issues/196)
     - it creates a non-root user called **bauh-aur** for building the packages (`useradd` and `runuser` commands must be installed)
 
+### Fixes
+- Arch
+  - missing error handling when hard requirements for optional dependencies cannot be found by pacman
 
 ## [0.9.22] 2021-11-30
 ### Improvements

bauh/gems/arch/controller.py

@@ -3474,6 +3474,8 @@ class ArchManager(SoftwareManager):
                     except PackageInHoldException:
                         self.logger.warning("There is a requirement in hold for opt dep '{}'".format(p))
                         continue
+                    except PackageNotFoundException:
+                        self.logger.warning(f"No hard requirements found for optional {p}. Reason: package not found")
 
         return res