When slowlog empty, undefined method `[]` for nil

[jim80net]

Critical exception from handler
{
"errorMessage": "undefined method `[]' for nil:NilClass",
"errorType": "Function<NoMethodError>",
"stackTrace": [
"/var/task/lib/slowlog_check.rb:119:in `did_i_get_it_all?'",
"/var/task/lib/slowlog_check.rb:126:in `redis_slowlog'",
"/var/task/lib/slowlog_check.rb:132:in `slowlogs_by_flush_interval'",
"/var/task/lib/slowlog_check.rb:210:in `ship_slowlogs'",
"/var/task/lambda_function.rb:64:in `lambda_handler'"
]
}

did_i_get_it_all? should return true when []