title: Forest package: skipping empty nodes
body: <p>Is there a way to have a line continue through an empty node in the Forest package?
  For example, with the code below:</p>
  <pre><code>\begin{figure}
      \centering
      \begin{forest}
          for tree={align=left, 
          font=\footnotesize\sffamily, 
          anchor=west, grow'=0, edge=thick, 
          l sep+=6mm, s sep=0mm, tier/.pgfmath=level()},
          forked edges,
          [a
              [b
                  [c 
                      [1 \\ 2]
                  ]
                  [d 
                      [3 \\ 4 \\ 5]
                  ]
              ]
              [e
                  [[ 6 \\ 7]]
              ]
          ]
      \end{forest}
      \caption{Example}
      \label{fig:ex}
  \end{figure}
  </code></pre>
  <p>the following figure is generated:</p>
  <p><a href="https://i.stack.imgur.com/Nq56s.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Nq56s.png" alt="enter image description here" /></a></p>
  <p>As you can see, I have no subcategories after &quot;e&quot;. However, I do want the numbers to be aligned, so for now, I just included an empty node. Currently, some empty space is shown at the position of the node. Would it be possible to circumvent this &quot;gap&quot; and have a straight line from &quot;e&quot; to the numbers instead?</p>
  <p>Looking forward to your suggestions!</p>