Fatal error in wp_reset_postdata()

[SergeyBiryukov]

[25601] introduced a ​fatal error when calling wp_reset_query() or wp_reset_postdata() without a valid $wp_query global:

Fatal error: Call to a member function reset_postdata() on a non-object in wp-includes/query.php on line 118

We should probably add a _doing_it_wrong() message in there, but at least let's fix the fatal error.

[SergeyBiryukov]

26775.patch​ uses a basic isset() check, like the ones we already have for template tags:
tags/3.8/src/wp-includes/query.php#L139​

[nacin]

This looks good.

[SergeyBiryukov]

Fixed for trunk in [26932].

[nacin]

In 26951:

Avoid a fatal error in wp_reset_postdata() if $wp_query global is not set.

Merges [25932] to the 3.9 branch.

props SergeyBiryukov.
fixes #26775.

[kovshenin]

In [26951] Nacin meant the 3.8 branch, not 3.9.

[nacin]

Indeed.