The print methods should return x invisibly

[agila5]

Is your feature request related to a problem? Please describe.
The generic print() states the following

print prints its argument and returns it invisibly (via invisible). It is a generic function which means that new printing methods can be easily added for new classes.

Therefore, I think that print.sfnetworks

sfnetworks/R/sfnetwork.R

Lines 370 to 371 in 43ecad6

	print.sfnetwork = function(x, ...) {
	# Define active and inactive component.

and print.morphed_sfnetwork

sfnetworks/R/sfnetwork.R

Lines 445 to 446 in 43ecad6

	print.morphed_sfnetwork = function(x, ...) {
	x_tbg = structure(x, class = setdiff(class(x), "morphed_sfnetwork"))

should terminate with invisible(x).

Describe the solution you'd like
Just add invisible(x) at the end of those methods.

Describe alternatives you've considered
Ignore the problem 😅

[luukvdmeer]

Fixed in v0.6.0