One another way is.,

while(($_ = scalar <>))  {
# remove the new line from that line.
  chomp;
  if ( /^\s+/ )  {
        # if there is no previous line then print the warning and cont
+inue reading the next line.,
        if ( not defined $cur_line )  {
              warn "continuation of no previous line\n";
              next;
        }
  # since it is a continuation line, concatenate it with the previous 
+line.,
  $cur_line.=$_;
  } else {
        # if the line does not contains the tab, then take that line a
+s the current line.,
        if (defined $cur_line) {
            # print the concatenated line.
            print $cur_line . "\n";
        }
        # store the current line in the variable
        $cur_line = $_;
    }
}
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