fix: make user_src_input generate valid javascript

user_src_input used to generate False if edit_ok == False in this
statement:

   tal:attributes="onblur python:edit_ok and 'split_name(this)';

but False isn't a boolean in javascript, so it throws an error in the
console. Changed to use:

   tal:attributes="onblur python:'split_name(this)' if edit_ok else '';

which generates an empty onblur if the field is not editable.

Author: rouilj

share/roundup/templates/classic/html/page.html

@@ -369,7 +369,7 @@ <h2><span metal:define-slot="body_title">body title</span></h2>
 
 <!-- src: value will be re-used for other input fields -->
 <input metal:define-macro="user_src_input"
-    type="text" tal:attributes="onblur python:edit_ok and 'split_name(this)';
+    type="text" tal:attributes="onblur python:'split_name(this)' if edit_ok else '';
     id name; name name; value value; readonly not:edit_ok"
     value="heinz.kunz">
 <!-- normal: no re-using -->

share/roundup/templates/devel/html/page.html

@@ -424,7 +424,7 @@ <h1 id="breadcrumb"><span metal:define-slot="body_title">body title</span></h1>
 
 <!-- src: value will be re-used for other input fields -->
 <input metal:define-macro="user_src_input"
-    type="text" tal:attributes="onblur python:edit_ok and 'split_name(this)';
+    type="text" tal:attributes="onblur python:'split_name(this)' if edit_ok else '';
     id name; name name; value value; readonly not:edit_ok"
     value="heinz.kunz"/>
 <!-- normal: no re-using -->

share/roundup/templates/minimal/html/page.html

@@ -331,7 +331,7 @@ <h2><span metal:define-slot="body_title">body title</span></h2>
 
 <!-- src: value will be re-used for other input fields -->
 <input metal:define-macro="user_src_input"
-    type="text" tal:attributes="onblur python:edit_ok and 'split_name(this)';
+    type="text" tal:attributes="onblur python:'split_name(this)' if edit_ok else '';
     id name; name name; value value; readonly not:edit_ok"
     value="heinz.kunz">
 <!-- normal: no re-using -->

share/roundup/templates/responsive/html/page.html

@@ -439,7 +439,7 @@ <h1><span metal:define-slot="body_title">body title</span></h1>
 
 <!-- src: value will be re-used for other input fields -->
 <input metal:define-macro="user_src_input"
-    type="text" tal:attributes="onblur python:edit_ok and 'split_name(this)';
+    type="text" tal:attributes="onblur python:'split_name(this)' if edit_ok else '';
     id name; name name; value value; readonly not:edit_ok"
     value="heinz.kunz"/>
 <!-- normal: no re-using -->