Just another way if you forgot about -a (autosplit), slightly longer, but is runnable code within a script...

perl -ne "(split)[1] || print" temp.txt
#same thing...
perl -ne "print if !((split)[1]);" temp.txt
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A Perl variable evaluates to false if either: undefined, numeric zero or "" (empty string).

Update: also of note: default split operates on whitespace which is (\s\t\f\r\n). Above would work fine with combination of spaces and tabs between tokens.