bug#30090: sql.el beginning-of-statement and end-of-statement result in an error

bug#30090: sql.el beginning-of-statement and end-of-statement result in an error

[Jarosław Rzeszótko]

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Sql mode beginning-of-statement and end-of-statement commands depend on the
:terminator property being set for sql-product, however only a few products
in sql.el have it defined, and there is no fallback value - prominently the
'ansi product does not have :terminator set. In effect if you sql mode will
product set to anything other than the few products that have :terminator
specified, you will get an error on using beginning-of-statement /
end-of-statement, that looks like this:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  looking-at(nil)
  sql-end-of-statement(1)
  funcall-interactively(sql-end-of-statement 1)
  call-interactively(sql-end-of-statement nil nil)
  command-execute(sql-end-of-statement)

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