erp5_document_scanner: prevent crashing the UI

Clicking on a button tag with an embedded img tag crashes everything.
The right way to fix this is probably to drop the img tag and use a CSS background url instead.

bt5/erp5_document_scanner/PathTemplateItem/web_page_module/scanner_gadget_document_scanner_js.js

@@ -1047,7 +1047,8 @@
         });
       }
 
-      throw new Error('Unhandled button: ' + evt.target.textContent);
+      // throw new Error('Unhandled button: ' + evt.target.textContent);
+      return;
     }, false, false)
 
     //////////////////////////////////////////////////

bt5/erp5_document_scanner/PathTemplateItem/web_page_module/scanner_gadget_document_scanner_js.xml

@@ -244,7 +244,7 @@
                   </item>
                   <item>
                       <key> <string>serial</string> </key>
-                      <value> <string>983.13237.65489.43861</string> </value>
+                      <value> <string>983.14351.3372.41932</string> </value>
                   </item>
                   <item>
                       <key> <string>state</string> </key>
@@ -262,7 +262,7 @@
                           </tuple>
                           <state>
                             <tuple>
-                              <float>1586875663.36</float>
+                              <float>1586942462.17</float>
                               <string>UTC</string>
                             </tuple>
                           </state>