Fix notices (non-fatal, so fixing optional)#61

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rmuit wants to merge 10 commits intod6lts:6.xfrom

Commits on Jan 21, 2021

Fix db_result() emitting “Notice: Trying to access array offset on value of type null” when called repeatedly on the same result set. (PHP7.4; Warning in PHP8)
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Fix "Trying to access array offset on value of type null" in user edit screen (PHP7.4)
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Fix "Trying to access array offset on value of type null" in forum_get_topics() (PHP7.4)
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Fix notice for array offset on value of type null in _drupal_build_css_path() (#3084953 backport; PHP7.4)
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Different implementation of #3084953 backport, which documents what’s going on rather than just adding an isset() somewhere. (Functionally equivalent, though.)
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Fix notices if menu_get_item() returns FALSE (#3085088 backport)
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Fix Undefined Index notices in block_admin_configure()
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Fix "Deprecated: Required parameter ... follows optional parameter" in PHP8
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Fix Notice: Undefined index: key in format_xml_elements() (#939810)
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Fix Notice: Undefined index: type in dblog_build_filter_query() (#1004820)
rmuit
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