Resolve "Room map images are fetched; regardless of whether they exist and whether the page even can display a map"

What does this mr do?

A client was looking for a room which could not be found. I was unable to find the cause of this and/or reproduce this bug. However this will solve the problem of errors being thrown constantly.

Actions taken to fix bug

Do not throw an exception when the room map cannot be found but just return an empty room.

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made and the bug I fixed.
• A test was created to test the bug.
• I have updated the documentation accordingly.
• I adhere to the style guide. closes #308 (closed)