openwisp / openwisp-radius / 8606670721

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[fix] Fix accounting stop handling for empty octets

Certain NAS devices, such as hostapd, may omit input/output octets
in accounting-stop requests. Consequently, FreeRADIUS represents
these fields as empty strings in API requests to this API. Django
REST Framework's validation rejects these requests as the fields
are defined as Integer fields and do not accept empty strings.

This patch addresses this issue by gracefully handling empty strings,
making the API more tolerant of varying system behaviors and
enhancing compatibility across heterogeneous systems.

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