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595660fb84
If a content.mk file wrongly refers to a non-existing directory in a call of the 'port_dir' function, the 'content_env_missing_ports.mk' gets stuck while invoking 'cat' without argument, which makes such mistakes difficult to diagnose. This patch adds a sanity check for the existence of the port hash file at the specified location before attempting to 'cat' the hash-file content.