[mv] [if] and its ilk

[Chris Rapier <rapier@psc.edu>]

******    message to minivend-users from Chris Rapier <rapier@psc.edu>     ******

One of problem I have having with the test store is that the following
code for generating the initial product categories listing:


[loop   search="
                        ra=yes
                        un=yes
                        rf=category
                        ml=10000
                "
] 
<LI> <A HREF="[area href=scan
                                    arg='
                                                sf=category
                                                se="[loop-code]"
                                                tf=category,artist
                                                ml=5
                                        '
                                ]">[loop-code]</A></LI>
[/loop]

Does not handle blank lines in the database very well. For example:
If the database contained
category	artist
good art	goya
bad art		kostabi
				<---- blank line
mediocre art	picasso

The following would be displayed as categories.

* good art
* bad art
* 
* mediocre art

I tried wrapping it inside of [if !value category eq ""]
but it didn't work at all the way I expected. I know that this 
should quite easy but I can't seem to figure it out. My feeling is
that I just don't know how to get the field value of category into 
the right place.

Chris Rapier
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