Omit blank lines when trimming fields with views
I've had a similar problem in the past, especially when making the summary trimmed to a shorter length.

When it tries to truncate certain tags like tables or images that can be quite long - and the number of characters you allow is reached before the table/image has been fully parsed, you can end up with a blank summary.

What I do is that I strip certain HTML tags from my fields that are trimmed to only display paragraphs, etc - not images and/or tables.

Just click on the field to set up the new configuration, and you'll find the option in the 'Rewrite Results' section:



Let us know if this works!