Wrong use of g_list_length() to know if a GList is empty

The following discussion from !76 (merged) should be addressed:

@antoniof started a discussion: (+3 comments)

No need to count the number of files here. According to GList API docs for g_list_length():

To check whether the list is non-empty, it is faster to check list against NULL.

There are cases of this slow usage in nautilus-window.c, nautilus-progress-persistence-handler.c, and nautilus-properties-window.c.

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