Bug Fix: Sequence Coordinate field showed -ve strand when strand was simply not set.

tripal_chado/includes/TripalFields/data__sequence_coordinates/data__sequence_coordinates.inc

@@ -243,9 +243,12 @@ class data__sequence_coordinates extends ChadoField {
         if ($featureloc->strand == 1) {
           $strand = '+';
         }
-        else {
+        elseif ($featureloc->strand == -1) {
           $strand = '-';
         }
+        else {
+          $strand = '';
+        }
         $fmin = $featureloc->fmin + 1;
         $fmax = $featureloc->fmax;
         $entity->{$field_name}['und'][$index] = array(