Impacted version: 0.49

Server Setup Information:

• Operating System: Ubuntu 16.04
• Deployment Method: snap
• ROOT_URL environment variable (Is there a subfolder?): https://my-domain.com/kan (yes)

Steps to reproduce:

1. Create a card
2. Enter a description which consists entirely of a (markdown-styled) code block, i.e. indented with 4 spaces:

    first line
    second line
   

3. Save the description

What happens:
The description is plain, unstylized text.

What I expect to happen:
For the description to be rendered as a code block.

How to work around this:
I have to enter at least one non-whitespace character followed by at least two newlines before entering the indented code block. Urgh :(