code: def getJSMinimumVolume(self, **kw):
          
          default = self.Schema()['MinimumVolume'].get(self)
          try:
              mgdefault = default.split(' ', 1)
              mgdefault = mg(float(mgdefault[0]), mgdefault[1])
          except:
              mgdefault = mg(0, 'ml')
          try:
              return str(mgdefault.ounit('ml'))
          except:
              pass
          try:
              return str(mgdefault.ounit('g'))
          except:
              pass
          return str(default)
docs: Try convert the MinimumVolume to 'ml' or 'g' so that JS has an
          easier time working with it.  If conversion fails, return raw value.