### Bug Description An invalid yaml file will result in a pyyaml errors being passed all the way to the user. `util.safe_yaml_load` should intercept this and replace it with a nicer error message. See: https://discourse.charmhub.io/t/charmcraft-3-1-1-fails-to-fetch-lib/14993 ### To Reproduce Run a `craft-application` project command on a project with an invalid yaml file (2 examples for charmcraft below) ### part yaml ```shell # Example charmcraft.yaml 1: --- --- # Example 2: type: - charm - invalid-indentation ``` ### Relevant log output ```shell Example 1: $ charmcraft fetch-lib charmcraft internal error: ComposerError('expected a single document in the stream', <yaml.error.Mark object at 0x7629eb7c4610>, 'but found another document', <yaml.error.Mark object at 0x7629eb7c4610>) Full execution log: '/home/lengau/.local/state/charmcraft/log/charmcraft-20240808-112442.474598.log' Example 2: $ charmcraft fetch-lib charmcraft internal error: ParserError('while parsing a block mapping', <yaml.error.Mark object at 0x70b7301f4700>, "expected <block end>, but found '<block sequence start>'", <yaml.error.Mark object at 0x70b7301f4df0>) Full execution log: '/home/lengau/.local/state/charmcraft/log/charmcraft-20240808-112635.246408.log' ```