[Bug]: Assertion error in CamGear API during colorspace manipulation

[abhiTronix]

Description

This bug directly affects colorspace manipulation in CamGear API. Due to this bug, the CamGear API currently exits itself with (-215:Assertion failed) !_src.empty() in function 'cvtColor' error with any colorspace because of the improper handling of threaded queue structure.

Acknowledgment

• A brief but descriptive Title of your issue
• I have searched the issues for my issue and found nothing related or helpful.
• I have read the FAQ.
• I have read the Wiki.
• I have read the Contributing Guidelines.

Environment

• VidGear version: 0.1.6-dev
• Branch: Development
• Python version: All
• pip version: All
• Operating System and version: All

Expected Behavior

No Assertion error while self-terminating.

Actual Behavior

Throws (-215:Assertion failed) !_src.empty() in function 'cvtColor' error on self-termination.

Code to reproduce

from vidgear.gears import CamGear
stream = CamGear(source=test.mp4, colorspace = 'COLOR_BGR2YUV', logging=True).start()
while True:
	frame = stream.read()
	# check if frame is None
	if frame is None:
		#if True break the infinite loop
		break
stream.stop()

On executing this function, It will self-terminate with (-215:Assertion failed) !_src.empty() in function 'cvtColor' error.

[abhiTronix]

Successfully resolved and merged in commit: c8a6339