I've got a custom VF page in which I'm trying to allow users to run a search from to find specific form numbers when ordering supplies.  However, I don't think I've set it up properly and could use some help trying to figure out where I've gone wrong because the search seems to at least execute, but not return any values to the intended table.

The lines from my controller governing the search are here:

public String query {get; set;}
  public List<MG_Forms__c> inventory {get; set;}
    
  public PageReference runQuery()
    {
        if(query.length() < 2){
        ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.FATAL, 'Search string must be at least two characters.' );
        ApexPages.addMessage(myMsg);
        return null;
        }
        List<List<MG_Forms__c>> searchResults=[FIND :query IN ALL FIELDS RETURNING MG_Forms__c (Form_Number__c, Name, Form_Title__c, State_Specific__c, Cancellable__c, In_Use__c)];
        inventory=searchResults[0];
        return null;
    }

The VF snippet for the search in the main page is here:

<script>
 var newWin=null;
 function openLookupPopup(name, id)
 {
  var url="/apex/Popup?namefield=" + name + "&idfield=" + id;
  newWin=window.open(url, 'Popup','height=500,width=600,left=100,top=100,resizable=no,scrollbars=yes,toolbar=no,status=no');
  if (window.focus)
  {
   newWin.focus();
  }
   return false;
    }
 function closeLookupPopup()
 {
    if (null!=newWin)
    {
       newWin.close();
    } 
 }
    </script>
      <apex:pageBlockSection >
          <apex:panelGroup >
          <apex:outputLabel for="item1">Select form number for Item 1:</apex:outputLabel>
         <apex:panelGroup >
          <apex:outputLabel for="item1">Select form number for Item 1:</apex:outputLabel>
          <apex:inputHidden value="{!MG_Forms__c.Name}" id="targetId" />
          <apex:inputText size="70" value="{!MG_Forms__c.Form_Number__c}" id="targetName" onFocus="this.blur()" disabled="false"/> <a href="#" onclick="openLookupPopup('{!$Component.targetName}', '{!$Component.targetId}'); return false">Lookup</a>
          

 And the VF for the Popup to conduct the search here:

<apex:page StandardController="MG_Forms__c" extensions="SupplyOrderController" sidebar="false" showheader="false">
<script language="javascript">
   window.onload = new function() 
   { 
      // bring popup window to front
      window.focus(); 
      var ele=document.getElementById('{!$Component.form.block.section.query}');
      if (ele)
      {
         ele.focus();
      }
   }
   
   function fillIn(name, id)
   {
      var winMain=window.opener;
      if (null==winMain)
      {
         winMain=window.parent.opener;
      }
      var ele=winMain.document.getElementById('{!$CurrentPage.parameters.namefield}');
      ele.value=name;
      ele=winMain.document.getElementById('{!$CurrentPage.parameters.idfield}');
      ele.value=id;
      CloseWindow();
   }

   function CloseWindow()
   {
      var winMain=window.opener;
      if (null==winMain)
      {
         winMain=window.parent.opener;
      }
      winMain.closeLookupPopup();
   }
</script>

  <apex:messages />
  <apex:form id="form" >  
        
     <div style="width 100%">
        <apex:pageBlock title="Lookup" id="block">
           
          <apex:pageBlockSection id="section">
              Enter search text and click Go<br/>
              <apex:inputText value="{!query}" id="query"/> 
              <apex:commandButton value="Go" action="{!runQuery}"/>
          </apex:pageBlockSection>
        </apex:pageBlock>

        <apex:pageBlock >
          <apex:pageBlockSection columns="1">
              <apex:pageBlockTable value="{!inventory}" var="MG_Forms__c">
                <apex:column headerValue="Form Number">
                  <apex:outputLink value="#" onclick="fillIn('{!MG_Forms__c.Form_Number__c}', '{!MG_Forms__c.Name}')">{!MG_Forms__c.Form_Title__c}</apex:outputLink>       
                </apex:column>
                <apex:column headerValue="State Specific" value="{!MG_Forms__c.State_Specific__c}"/>
                <apex:column headerValue="Cancellable" value="{!MG_Forms__c.Cancellable__c}"/>
                <apex:column headerValue="In Use" value="{!MG_Forms__c.In_Use__c}"/>
                </apex:pageBlockTable>    
          </apex:pageBlockSection>
        </apex:pageBlock>
        <button type="button" onclick="CloseWindow();">Close Window</button>
     </div>
   </apex:form>
</apex:page>