Autocrop Objects Needs Attention

[maliagehan]

Describe the bug Autocrop object currently requires indexing otherwise does not work. Works: crop_img = pcv.auto_crop(img=img, objects=roi_objects[0], padding_x=20, padding_y=20, color='black')

To Reproduce Steps to reproduce the behavior (including sample data and code really help):

1. Starting with image '...'
2. Run function(s) '....'
3. See error

Expected behavior A clear and concise description of what you expected to happen.

Local environment (please complete the following information):

• OS: [e.g. Linux, macOS, Windows]
• Environment [e.g. conda, virtualenv, pip, docker, etc.]
• PlantCV Version [e.g. 3.6.0]

Additional context Add any other context about the problem here.

[maliagehan]

One solution could be to check number of contours and add a loop if more than one.