Make default value for vfs.s3.region
in test conditional
#2086
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Following TileDB-Inc/TileDB#5317, the default value of
vfs.s3.region
has been changed to empty. This change allows AWS to select the default region from sources such as environment variables, profile configuration, and instance metadata.This PR modifies some assertions that check the default value of
vfs.s3.region
when related environment variables are present.Should fix the related error in TileDB-Inc/centralized-tiledb-nightlies#24
cc @jdblischak