revert to not accepting having both fields blank

mason/breeders_toolbox/add_seedlot_dialogs.mas

@@ -121,13 +121,13 @@ $cross_uniquename => ''
                 <div class="form-group">
                     <label class="col-sm-3 control-label">Amount (number of seeds): </label>
                     <div class="col-sm-9" >
-                        <input class="form-control" id="seedlot_amount" placeholder="Optional">
+                        <input class="form-control" id="seedlot_amount" placeholder="Amount OR Weight(g) Required">
                     </div>
                 </div>
                 <div class="form-group">
                     <label class="col-sm-3 control-label">Weight (g): </label>
                     <div class="col-sm-9" >
-                        <input class="form-control" id="seedlot_weight" placeholder="Optional">
+                        <input class="form-control" id="seedlot_weight" placeholder="Amount OR Weight(g) Required">
                     </div>
                 </div>
                 <!--
@@ -207,6 +207,7 @@ jQuery(document).ready(function(){
         if (name == '') { alert("Please provide a name"); return; }
         else if (location == '') { alert("Please provide a location"); return; }
         else if (box_name == '') { alert("Please provide a box name"); return; }
+        else if (amount == '' && weight == '') { alert("Please provide a seed count amount or a weight in grams!"); return; }
         else if (isNaN(amount)) { alert("If inputting a seed count amount, it must be a numeric value."); return; }
         else if (isNaN(weight)) { alert("If inputting a weight, it must be a numeric value."); return; }
         else if (breeding_program_id == '') { alert("Please select a breeding program"); return; }