Open the link in new tab only if the link exists

Resources/Private/Partials/Journal/Content.html

@@ -107,7 +107,14 @@
                     <a href="{journal.accessData.authorInstructionsUrl}" target="_blank" rel="noopener noreferrer" class="m-2 link-button btn btn-outline-primary"><f:translate key="result.authorInstructions"/></a>
                     <a href="{journal.accessData.aimsAndScopeUrl}" target="_blank" rel="noopener noreferrer" class="m-2 link-button btn btn-outline-primary"><f:translate key="result.aimsScope"/></a>
                     <a href="{journal.accessData.editorialBoardUrl}" target="_blank" rel="noopener noreferrer" class="m-2 link-button btn btn-outline-primary"><f:translate key="result.editorialBoard"/></a>
-                    <a href="{journal.filter.source}" target="_blank" rel="noopener noreferrer" class="m-2 link-button btn btn-outline-primary"><f:translate key="result.priceSource"/></a>
+                    <f:if condition="{journal.filter.source}">
+                        <f:then>
+                            <a href="{journal.filter.source}" target="_blank" rel="noopener noreferrer" class="m-2 link-button btn btn-outline-primary"><f:translate key="result.priceSource"/></a>
+                        </f:then>
+                        <f:else>
+                            <a href="" rel="noopener noreferrer" class="m-2 link-button btn btn-outline-primary"><f:translate key="result.priceSource"/></a>
+                        </f:else>
+                    </f:if>
 
                     <div class="mt-4">
                         <h5><f:translate key="result.subjects"/>:</h5>