net_line.patch

diff --git schematic/sheet.cpp schematic/sheet.cpp
index 94b7c1a..f816d2d 100644
--- schematic/sheet.cpp
+++ schematic/sheet.cpp
@@ -67,7 +67,12 @@ namespace horizon {
 				const json &o = j["net_lines"];
 				for (auto it = o.cbegin(); it != o.cend(); ++it) {
 					auto u = UUID(it.key());
-					net_lines.emplace(std::make_pair(u, LineNet(u, it.value(), this)));
+					try {
+						net_lines.emplace(std::make_pair(u, LineNet(u, it.value(), this)));
+					}
+					catch (...){
+						std::cout << "error loading net line " << (std::string) u << std::endl;
+					}
 				}
 			}
 			{