Bug #1274 exception if no computed pipeline

pipelet/web.py

@@ -237,17 +237,23 @@ class Web:
         """
         conn = sqlite3.connect(self.db_file,check_same_thread=True)
         conn.text_factory=str
+
+        html = html_tmp 
+        html += '<a class="icon home" href="/%s/"><small>Home</small></a>'%(self.name)
+        html += '<h1>Pipelines in %s </h1>'%self.name
+
         # get all instances
         with conn:
             l = conn.execute('select seg, curr_dir, seg_id, param from segments order by curr_dir').fetchall()
             tcounts = conn.execute('select seg_id, status, count() from tasks group by seg_id, status order by seg_id').fetchall()
-        sindex = [e[0] for e in tcounts]
-        index = [[] for i in range(max(sindex)+1)]
-        for i, s in enumerate(sindex): index[s].append(i)
         
-        html = html_tmp 
-        html += '<a class="icon home" href="/%s/"><small>Home</small></a>'%(self.name)
-        html += '<h1>Pipelines in %s </h1>'%self.name
+        try:
+            sindex = [e[0] for e in tcounts]
+            index = [[] for i in range(max(sindex)+1)]
+            for i, s in enumerate(sindex): index[s].append(i)
+        except ValueError:
+            html += 'No computed pipeline !</div></body></html>'
+            return html
 
         ## Filter fieldset
         html += '<fieldset id="filters"><legend><span class="text">Filters</span></legend>'
@@ -286,6 +292,7 @@ class Web:
         log_dir = l[0][1].split("_")[0]
         seg_1   = log_dir.split("/")[-1]
         log_dir = log_dir[0:len(log_dir)-len(seg_1)]+ "log"
+        
 
         ## Buttons
         html += '<tr></tr>'