Currently if analysis server fails to resolve this directory, it will
crash the entire process with
NoSuchMethodError: The method 'getChild' was called on null.
_readUuid() was already failing over to generating a new random
identifier if it was either unable to find a uuid.txt file or
create one, so this change just triggers that behavior additionally
in the case that the parent directory is missing.
R=brianwilkerson@google.com
Change-Id: Ieafde2df5afd7e30a3830f241af02bf305c911ec
Reviewed-on: https://dart-review.googlesource.com/c/88428
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Ari Aye <ariaye@google.com>
5f25d1546c