SPATIAL fields with no unique index/autoincrement error when clicking

[ibennetch]

I discovered this when looking at #14067; maybe it's related or a duplicate.

Steps to reproduce

1. Start with a table containing no unique index (which will cause grid editing to fall back to our best effort to isolate the correct row):

CREATE TABLE `ptt` (
 `pt` POINT DEFAULT NULL
) ENGINE=InnoDB;

INSERT INTO `ptt` (`pt`) VALUES (NULL), (PointFromText('POINT(1 1)'));

2. Browse the table and click the data, which should offer to download the row (or maybe let me edit it).

Expected behaviour

I should either be offered to download the data or grid edit.

Actual behaviour

An error is shown without any of the phpMyAdmin menu bar, navigation pane, etc:

Error

SQL query: DocumentationEdit Edit

SELECT `pt` FROM `ptt` WHERE ;

MySQL said: Documentation
MySQL returned an empty result set (i.e. zero rows).

Server configuration

Operating system:
Debian
Web server:
Apache
Database:
MariaDB 10.1.26
PHP version:
7.0.27
phpMyAdmin version:
master

Client configuration

Browser:
Firefox
Operating system:
MacOS

[nulll-pointer]

Without any unique column, there can be no where clause for a particular tuple.

Also, the Well known text format in the options gives a bunch of errors and the values are empty.