aiidateam / aiida_core / 4397

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Fix bug in `parse_formula` for formula's with leading or trailing whitespace (#2186)

If a formula contains leading or trailing whitespace, one of the parts over
which the function loops will be empty, and so the regex match `m` will be
`None`. To prevent an `AttributeError` from being thrown when `group` is
called on `None` we check for it and continue.

2 of 2 new or added lines in 1 file covered. (100.0%)

25402 of 37031 relevant lines covered (68.6%)

2.41 hits per line