project: Fix raise-without-from-inside-except (B904)

Derived from flake8-bugbear, see
https://docs.astral.sh/ruff/rules/raise-without-from-inside-except/

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>

Author: pdgendt

src/west/app/config.py

@@ -169,11 +169,11 @@ def delete(self, args):
             try:
                 self.config.delete(args.name, configfile=configfile)
                 return
-            except KeyError:
+            except KeyError as err:
                 if i == len(configfiles) - 1:
                     self.dbg(
                         f'{args.name} was not set in requested location(s)')
-                    raise CommandError(returncode=1)
+                    raise CommandError(returncode=1) from err
             except PermissionError as pe:
                 self._perm_error(pe, configfile, args.name)
 

src/west/configuration.py

@@ -99,8 +99,8 @@ def _get(self, option, getter):
 
         try:
             return getter(section, key)
-        except (configparser.NoOptionError, configparser.NoSectionError):
-            raise KeyError(option)
+        except (configparser.NoOptionError, configparser.NoSectionError) as err:
+            raise KeyError(option) from err
 
     def set(self, option: str, value: Any):
         section, key = _InternalCF.parse_key(option)

src/west/manifest.py

@@ -1920,12 +1920,12 @@ def get_option(option, default=None):
             current_abspath = topdir_abspath / current_relpath
             try:
                 current_data = current_abspath.read_text(encoding=Manifest.encoding)
-            except FileNotFoundError:
+            except FileNotFoundError as err:
                 raise MalformedConfig(
                     f'file not found: manifest file {current_abspath} '
                     '(from configuration options '
                     f'manifest.path="{manifest_path_option}", '
-                    f'manifest.file="{manifest_file}")')
+                    f'manifest.file="{manifest_file}")') from err
 
             current_repo_abspath = topdir_abspath / manifest_path