no longer crashing with invalid campus urls. closes #148

importer.py

@@ -32,7 +32,10 @@ def import_from(source=None, id=None):
 		import urllib.request
 		# if u have to port this to anything new, god be with you.
 		for i in import_campus:
+			try:
 				remote_html = urllib.request.urlopen(i['url']).read()
+			except:
+				flash("Ungültige URL: '"+i['url']"'")
 			tablexpath = "//td[text()='Termine und Ort']/following::table[1]"
 			basetable = html.fromstring(remote_html).xpath(tablexpath)[0]
 			parsebase = html.tostring(basetable);