some fixes

extensions/fablabchemnitz/chain_paths.py

@@ -142,8 +142,7 @@ class ChainPaths(inkex.Effect):
       return
 
     segments = []
-    for id in self.svg.selected:
-      node = self.svg.selected[id]
+    for id, node in self.svg.selected.items():
       if node.tag != inkex.addNS('path', 'svg'):
         inkex.errormsg("Object " + id + " is not a path. Try\n  - Path->Object to Path\n  - Object->Ungroup")
         return

extensions/fablabchemnitz/contourscanner/contour_scanner.py

@@ -241,7 +241,8 @@ class ContourScanner(inkex.Effect):
                         #    polySegsNode.attrib['style'] = closingLineStyle
 
                     except AssertionError as e: # we skip AssertionError
-                        inkex.utils.debug("Error: " + str(e))
+                        #inkex.utils.debug("Error: " + str(e))
+                        continue
                 #if the intersectionGroup was created but nothing attached we delete it again to prevent messing the SVG XML tree
                 if len(intersectionGroup.getchildren()) == 0:
                     intersectionGroupParent = intersectionGroup.getparent()