local variable 'pic_title' referenced before assignment

[Saidgurbuz]

In

docling-core/docling_core/types/doc/document.py

Line 4046 in 062124e

chart_data=table_data, title=pic_title

we get the error of local variable 'pic_title' referenced before assignment, since pic_title is not defined in outer block.

which is defined and used in the previous if block as below

docling-core/docling_core/types/doc/document.py

Lines 3990 to 4003 in 062124e

	pic_title = "picture"
	if chart_type is not None:
	pic.annotations.append(
	PictureClassificationData(
	provenance="load_from_doctags",
	predicted_classes=[
	# chart_type
	PictureClassificationClass(
	class_name=chart_type, confidence=1.0
	)
	],
	)
	)
	pic_title = chart_type

[nassarofficial]

#428 this PR should fix it