Fix Remnote2Obsidian script breaking with blank rem objects#20

Hey there! I want to thank you for making such a great Remnote-to-Obsidian converter, it certainly saved me a few headaches when moving my notes over. It seems the original script ends up breaking whenever there are untitled blank rem objects in the `rem.json` output, as it assumes every object in the list is a dictionary. When I checked the JSON, the untitled blank rems are instead in the following array format: ```json [0] ``` As these rems are completely empty there really isn't a need for them to be imported over, so I went ahead and added a check to the `getAllDocs` function to ignore any non-dict objects.