custom schema for tabular parser are failing to process

related to https://matsci.org/t/the-tabular-data-example-upload-not-working/56597/8

added bugfixes parsers labels

assigned to @amgo

created branch 2083-custom-schema-for-tabular-parser-are-failing-to-process to address this issue

mentioned in merge request !1993 (merged)

closed with merge request !1993 (merged)

mentioned in commit 0347838e

mentioned in issue #2077 (closed)