diff --git a/app/scodoc/sco_edit_ue.py b/app/scodoc/sco_edit_ue.py
index 9d9eadf5..d581bb65 100644
--- a/app/scodoc/sco_edit_ue.py
+++ b/app/scodoc/sco_edit_ue.py
@@ -643,7 +643,7 @@ def ue_table(formation_id=None, semestre_idx=1, msg=""):  # was ue_list
     parcours = formation.get_parcours()
     is_apc = parcours.APC_SAE
     locked = formation.has_locked_sems()
-    if semestre_idx == "all":
+    if semestre_idx == "all" or semestre_idx == "":
         semestre_idx = None
     else:
         semestre_idx = int(semestre_idx)
diff --git a/app/scodoc/sco_page_etud.py b/app/scodoc/sco_page_etud.py
index 259bbe33..2bc1cc7a 100644
--- a/app/scodoc/sco_page_etud.py
+++ b/app/scodoc/sco_page_etud.py
@@ -30,7 +30,7 @@
    Fiche description d'un étudiant et de son parcours
 
 """
-from flask import url_for, g, request
+from flask import abort, url_for, g, request
 from flask_login import current_user
 
 import app.scodoc.sco_utils as scu
@@ -582,24 +582,23 @@ def etud_info_html(etudid, with_photo="1", debug=False):
     """
     formsemestre_id = sco_formsemestre_status.retreive_formsemestre_from_request()
     with_photo = int(with_photo)
-    etud = sco_etud.get_etud_info(filled=True)[0]
+    etuds = sco_etud.get_etud_info(filled=True)
+    if etuds:
+        etud = etuds[0]
+    else:
+        abort(404, "etudiant inconnu")
     photo_html = sco_photos.etud_photo_html(etud, title="fiche de " + etud["nom"])
     # experimental: may be too slow to be here
-    etud["codeparcours"], etud["decisions_jury"] = sco_report.get_codeparcoursetud(
-        etud, prefix="S", separator=", "
-    )
+    codeparcours, _ = sco_report.get_codeparcoursetud(etud, prefix="S", separator=", ")
 
     bac = sco_bac.Baccalaureat(etud["bac"], etud["specialite"])
-    etud["bac_abbrev"] = bac.abbrev()
-    H = (
-        """<div class="etud_info_div">
+    bac_abbrev = bac.abbrev()
+    H = f"""<div class="etud_info_div">
     <div class="eid_left">
-     <div class="eid_nom"><div>%(nomprenom)s</div></div>
-     <div class="eid_info eid_bac">Bac: <span class="eid_bac">%(bac_abbrev)s</span></div>
-     <div class="eid_info eid_parcours">%(codeparcours)s</div>
+     <div class="eid_nom"><div>{etud["nomprenom"]}</div></div>
+     <div class="eid_info eid_bac">Bac: <span class="eid_bac">{bac_abbrev}</span></div>
+     <div class="eid_info eid_parcours">{codeparcours}</div>
     """
-        % etud
-    )
 
     # Informations sur l'etudiant dans le semestre courant:
     sem = None
@@ -610,7 +609,7 @@ def etud_info_html(etudid, with_photo="1", debug=False):
     if sem:
         groups = sco_groups.get_etud_groups(etudid, formsemestre_id)
         grc = sco_groups.listgroups_abbrev(groups)
-        H += '<div class="eid_info">En <b>S%d</b>: %s</div>' % (sem["semestre_id"], grc)
+        H += f"""<div class="eid_info">En <b>S{sem["semestre_id"]}</b>: {grc}</div>"""
     H += "</div>"  # fin partie gauche (eid_left)
     if with_photo:
         H += '<span class="eid_right">' + photo_html + "</span>"