repr of max_symbolic and min_symbolic when passed a list argument

[embray]

I noticed in testing #24758 a minor issue when displaying symbolic min/max objects with hold=True that the repr is useless given a list argument:

sage: max_symbolic([1, 2], hold=True)
max(<listiterator object at 0x7fb40a873d50>)

This is a problem on both Python 2 and 3--it might be a regression too but I'm not sure.

Component: symbolics

Issue created by migration from https://trac.sagemath.org/ticket/26650

[embray]

comment:1

Retargeting some of my tickets (somewhat optimistically for now).

[embray]

comment:2

Removing most of the rest of my open tickets out of the 8.7 milestone, which should be closed.