Stored function not accepting null value?

<div class="Section1"><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">I am using a stored function to determine whether a table needs an update or insert, based on the
merge_dbfunction in the postgres documentation. (Not currently including it below because it’s rather long, but other
thanthe fact that it contains 27 values, it’s pretty much the same as that example.)</span></font><p
class="MsoNormal"><fontface="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">It works fine as long as all the values are defined: </span></font><p class="MsoNormal"><font
face="Arial"size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">select event_archive (7, 2, 2, 2, 3, text 'TIMS', 3, text 'I-90', 2, 3, 1.2, 1.3, 3, 1, 2, text
'important',timestamp '2008-01-01', </span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">timestamp '2008-01-01', timestamp '2008-01-01', timestamp '2008-01-01',  timestamp '2008-01-01', 
text'2 hours', timestamp '2008-01-01', timestamp '2008-01-01', text 'oak', text 'main', 2);</span></font><p
class="MsoNormal"><fontface="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">but if I change any of the above values to null, the function simply doesn’t operate.
</span></font><pclass="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">select event_archive (7, 2, 2, 2, 3, text 'TIMS', 3, text 'I-90', 2, 3, 1.2, 1.3, 3, 1, 2, text
'important',timestamp '2008-01-01', </span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">timestamp '2008-01-01', timestamp '2008-01-01', timestamp '2008-01-01',  timestamp '2008-01-01', 
text'2 hours', timestamp '2008-01-01', timestamp '2008-01-01', text 'oak', text 'main', null);</span></font><p
class="MsoNormal"><fontface="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">It returns:</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">Total query runtime: 0 ms.</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial">1 rows retrieved.</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">versus a runtime of about 13ms when it successfully updates or inserts. I put raise notices into the
functionto try to debug, and it never even hits the first one in the first LOOP when there is a null
value.</span></font><pclass="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">The only column in the table that is declared not null would be the 7 in the above statement (id),
allother fields should be able to accept a null value.  Is this a known limitation with functions, or am I doing
somethingincorrectly?</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Thanks,</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">DHall</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
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