title: How can I join adjacent lines based on whether their first field is empty?
body: <p>Can I append a line to the previous one based on whether the first few characters are blank?</p>
  
  <p>For example, I have data below:</p>
  
  <pre><code>zone:  z_ABCSVR01_STORAGE1
                  ABCSVR; STORAGE1_P1;
          STORAGE_P2  
  zone:  z_SUNSVR1_NBUSANCP
                  SUNSVR1; NBUSANCP;
  zone:  z_WINSVR01_STORAGE2
                  WINSVR01; STORAGE1_P2;
          STORAGE_P3
  </code></pre>
  
  <p>And I need the output below:</p>
  
  <pre><code>z_ABCSVR01_STORAGE1 ABCSVR; STORAGE1_P1;    STORAGE_P2                      
  z_SUNSVR1_NBUSANCP  SUNSVR1; NBUSANCP;               
  z_WINSVR01_STORAGE2 WINSVR01; STORAGE1_P2;  STORAGE_P3     
  </code></pre>