test for a empty node

My xml is as follows:
<organisations>
   <orgRecord>
                <orgID>1</orgID>>
                <organisation>World Health</organisation>
                <street>3 street </street>
                <city>Liverpool</city>
                <state></state>
                <postalCode>L42 GH</postalCode>
                -----
  </orgRecord>
</organisations>

I need to concatenate the address fields:
<xsl:value-of select="concat(street, ', ', city, ', ', state, ', ',
postalCode)"/>

Which returns me the values of each like this:
street, city, state, postalCode

I have two problems:
1. I would prefer the output to look like this
street,
city,
state,
postalCode
2. Is there way to check that if a "state" does not exist i.e.
<state></state> (as in xml) to return:
street,
city,
postalCode

As opposed to either:
(a) street,
     city,
     <!--empty space-->
      postalCode

(b) street, city,  , postalCode

Thanks

Tanz



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