remove unnecessary nil check

[knbr13]

pubsub/pubsub.go:565: remove unnecessay nil check.

var slice []byte
if slice != nil && len(slice) > 0 {}
// is the same as
if len(slice) > 0 {}

because len(slice) where slice == nil is always equal to 0,

staticcheck will highlight this optimization with the following message:

pubsub/pubsub.go:565:9: should omit nil check; len() for []*gocloud.dev/pubsub/driver.Message is defined as zero (S1009)

for reference: staticcheck S1009

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.25%. Comparing base (9e81e8d) to head (404f338).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3517      +/-   ##
==========================================
- Coverage   73.26%   73.25%   -0.02%     
==========================================
  Files         113      113              
  Lines       15065    15065              
==========================================
- Hits        11038    11036       -2     
- Misses       3261     3263       +2     
  Partials      766      766              

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