fix(oauth2) prevent a crash when using a global token #4262
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When using a token issued by a plugin with `global_credentials = true`
against a plugin with `global_credentials = false`, the plugin would
crash due to some indexing of nil fields.
[kong] access.lua:49 [oauth2] failed to get from node cache: callback threw an error: /usr/local/share/lua/5.1/kong/plugins/oauth2/access.lua:580:
attempt to index field 'service' (a nil value)
Fix #4232
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When using a token issued by a plugin with
global_credentials = trueagainst a plugin with
global_credentials = false, the plugin wouldcrash due to some indexing of nil fields.
Fix #4232