ecpg: Add missing NULL check in ecpg_store_input() following OOM failure

ecpg_store_input() called strlen() directly on the result of
PGTYPESnumeric_to_asc() without checking for a NULL value, state
possible when the function fails due to an out-of-memory failure.

This error is unlikely going to be hit in practice, so no backpatch is
done.

Author: Gladyshev Ilya <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/c83f7e727f20a680a5bb874e2e4d699a0f3ee68f

Modified Files
--------------
src/interfaces/ecpg/ecpglib/execute.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

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