mappings/VegCore-VegBIEN.csv: _is_higher_taxon() calls: Default to true if the rank can't be parsed to a taxonrank enum value

sql_io.py: put_table(): is_function: Moved definition of wrapper function inside try block of main loop because the creation of the empty pkeys table (whose row type is needed for the wrapper function) can itself produce MissingCastExceptions, which must be thrown inside the loop in order to be handled properly

db_xml.py: put(): Indicate no parent_ids_loc using no_parent_ids_loc sentinel instead of None to support parent_ids_locs that are equal to None (e.g. if the parent node had an error). Always forward parent_ids_loc to children with fkeys to parent, even on error, because the parent table may not be required for the child tables to be valid, such as for taxonomic-data-only datasets that nevertheless have nodes for the non-taxonomic tables in their mappings.

sql.py: parse_exception(): types cannot be matched MissingCastException: Use the first type as the type to cast to instead of text

sql.py: parse_exception(): InvalidValueException: Fixed bug in regexp where can't use .*? before (?:...)? surrounding matched value, because it prevents the value from being matched now that it is optional

inputs/.NCBI/nodes/header.csv: Updated for new staging table format, which includes a row_num column in each joined table

inputs/.NCBI/nodes/create.sql: Updated for new src table names

xml_func.py: process(): Pass on_error through to sql_io.put(). This fixes a bug in row-based import where DB errors in the xml_func.process() phase would abort the entire import instead of being tracked and having the return value set to None.

sql_io.py: put(): Pass on_error through to put_table()

sql_io.py: put_table(): log_exc(): Return False if removing all rows and have callers break the main loop so that no further exception-handling code is processed before the main loop is exited