Update flash.rb - Githubissues

SFEley / sinatra-flash

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Update flash.rb #12

Open ggoral opened 4 years ago

ggoral commented 4 years ago

After run test on a sinatra application we found next error "sinatra-flash-0.3.0/lib/sinatra/flash.rb:15: warning: instance variable @flash not initialized"

We fix this issue adding a simple "defined?" method.