tweak marginnote-image to ensure there is some alt text

_includes/feature/marginnote-image.html

@@ -3,6 +3,6 @@
 <label for="{{include.id}}" class="margin-toggle mb-3">&#8853;</label>
 <input type="checkbox" id="{{include.id}}" class="margin-toggle" />
 <span class="marginnote {{include.class}}"><a href="{% if include.link %}{{include.link}}{% elsif item.objectid %}{{ item.objectid | append: '.html' | prepend: '/items/' | relative_url }}{% else %}{{ image_src }}{% endif %}">
-<img alt="{{ item.description | escape }}" src="{{image_src | relative_url}}" style="width:{{ include.image-width | default: '70'}}%" /></a>
+<img alt="{{ item.description | default: item.title | default: item.caption | escape }}" src="{{image_src | relative_url}}" style="width:{{ include.image-width | default: '70'}}%" /></a>
 <br>
 <span class="pt-4 figure-caption text-center">{{include.caption }}</span></span>

pages/cult-classics.md

@@ -68,7 +68,7 @@ If the internet has ushered us into the age of digital, video rental stores belo
 
  Like being {% include feature/youtube-clip-modal.html text="in a used bookstore" objectid="mainstreet005" start="196" %}, there’s something magical about being surrounded by stories that are ready to transport you to another country, world, or life, should you decide to check them out.
 
-Depending on your generation, the shelves were stocked predominantly with VHS tapes,{% include feature/marginnote-image.html img="https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/VHS-Video-Tape-Top-Flat.jpg/2560px-VHS-Video-Tape-Top-Flat.jpg" caption="This is a VHS tape." %} DVDs,{% include feature/marginnote-image.html img="https://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Oxygen480-devices-media-optical-dvd.svg/1200px-Oxygen480-devices-media-optical-dvd.svg.png" caption="This is a DVD." %} or a combination. If there was VHS in the room, {% include feature/youtube-clip-modal.html text="you could likely smell it" objectid="mainstreet021" start="170" %}—the tapes gave off a plasticky, petroleum-laced odor that was especially pungent when recently ejected from a VCR.{% include feature/marginnote-image.html img="https://media.npr.org/assets/img/2016/07/21/vcr_9752-edit_wide-8a2db6a89eb4efc20bfa259a4fb01d888915ed28.jpg?s=1400" caption="A VHS being ejected from a VCR." %} 
+Depending on your generation, the shelves were stocked predominantly with VHS tapes,{% include feature/marginnote-image.html img="https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/VHS-Video-Tape-Top-Flat.jpg/2560px-VHS-Video-Tape-Top-Flat.jpg" caption="This is a VHS tape." title="VHS tape" %} DVDs,{% include feature/marginnote-image.html img="https://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Oxygen480-devices-media-optical-dvd.svg/1200px-Oxygen480-devices-media-optical-dvd.svg.png" caption="This is a DVD." title="DVD disc" %} or a combination. If there was VHS in the room, {% include feature/youtube-clip-modal.html text="you could likely smell it" objectid="mainstreet021" start="170" %}—the tapes gave off a plasticky, petroleum-laced odor that was especially pungent when recently ejected from a VCR.{% include feature/marginnote-image.html img="https://media.npr.org/assets/img/2016/07/21/vcr_9752-edit_wide-8a2db6a89eb4efc20bfa259a4fb01d888915ed28.jpg?s=1400" caption="A VHS being ejected from a VCR." title="" %} 
 DVDs were sleeker, trading the boxy VHS for compact packaging and a flat, shiny disc. 
 
 While DVDs offered improved visuals and sound, tapes were more durable. Barring their tendency to melt if left {% include feature/youtube-clip-modal.html text="too long in a hot car" objectid="mainstreet003" start="745" %}, their malfunctions were few and generally easy to fix: