How to scrape link from td tag if it is available and append "NA " if td is empty

<tr>
<td>
<a href="/wiki/Alabama_Judicial_Building" title="Alabama Judicial Building">Alabama Administrative Office of Courts Museum Area</a>
</td>

<td>
<a href="/wiki/File:Ala_Supreme_Court_Building_Feb_2012_01.jpg" class="image"><img alt="Ala Supreme Court Building Feb 2012 01.jpg" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Ala_Supreme_Court_Building_Feb_2012_01.jpg/100px-Ala_Supreme_Court_Building_Feb_2012_01.jpg" decoding="async" width="100" height="75" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Ala_Supreme_Court_Building_Feb_2012_01.jpg/150px-Ala_Supreme_Court_Building_Feb_2012_01.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/92/Ala_Supreme_Court_Building_Feb_2012_01.jpg/200px-Ala_Supreme_Court_Building_Feb_2012_01.jpg 2x" data-file-width="1600" data-file-height="1200"></a>
</td>

<td>
<a href="/wiki/Montgomery,_Alabama" title="Montgomery, Alabama">Montgomery</a></td>

<td>
<a href="/wiki/Montgomery_County,_Alabama" title="Montgomery County, Alabama">Montgomery</a> 
</td>

<td>Central</td>

<td>Law</td>

<td>Exhibits of Alabama judicial history and important figures, located in the Alabama Judicial Building.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1">[1]</a></sup>
</td>

</tr>
<tr>
<td>Alabama Artists Gallery</td>
<td></td>   <---- Here this tag is empty so how i append "Na"
<td>Montgomery</td>
<td>Montgomery</td>
<td>Central</td>
<td>Art</td>
<td>Operated by the Alabama State Council on the Arts, located on the first floor of the RSA Tower, <a rel="nofollow" class="external text" href="http://www.arts.state.al.us/gallery.aspx">website</a>
</td></tr>

image_web = driver.find_elements_by_xpath('//table[@class="wikitable sortable jquery-tablesorter"]//tbody//tr//td[2]')

for i in image_web:
    print(i)