added to extendedEdgeMesh fails

extendedEdgeMesh.C

• lines 1270-1273 -> need sublist to handle zero-sized lists (or segfault)
• line 1274: needs fem.edgeNormals() to have the correct size for the looping.

@Mattijs

closed via commit 98ad17c6617af8995499e7348f9ca3c298c29b85

mentioned in commit 98ad17c6617af8995499e7348f9ca3c298c29b85

mentioned in commit b42424cb