I have custom objects and a custom controller

content_Body__c is a child of content__c  There can be multiple children.

The controller get method looks like this:

    public Content__c getContent() {
        Content__c content =
            [select id, Name, Release_Date__c, Heading__c, Synopsis__c,
                (select Name, Content__c, URL_Link__c, Image__c, Description_Text__c
                from Content_Body__r order by name)
            from Content__c where id = :thisContent LIMIT 1];
        return content;
    }

and in a vf page this

            {!content.Name}<br/>
            {!content.Release_Date__c}<br/>
            {!content.Heading__c}<br/>
            {!content.Synopsis__c}<br/>
            <div class="article-content">
                <apex:outputText escape="false" value="{!content.content_body__r[0].Image__c}" />
                <apex:outputText escape="false" value="{!content.content_body__r[0].URL_Link__c}" />
                <apex:outputText escape="false" value="{!content.content_body__r[0].Description_Text__c}" />
             </div>

renders fine.

But I want to display all the related content_body__c elements, so I'm using apex:repeat, and this

        <apex:repeat var="cb" value="{!content.content_body__r}" >
            <div class="article-content">
                <apex:outputText escape="false" value="{!cb.Description_Text__c}" />
            </div>
        </apex:repeat>

gives a run-time error of

List has no rows for assignment to SObject
An unexpected error has occurred. Your development organization has been notified.

What am I doing wrong here?  How can there be no rows when the explicit [0] reference finds one???