Add a trailing newline.

Also check that the config was able to be read.

src/addon/manager.cpp

@@ -175,7 +175,7 @@ std::map<std::string, std::string> installed_addons_and_versions()
 		} else if(filesystem::file_exists(get_info_file_path(addon_id))) {
 			config temp;
 			get_addon_install_info(addon_id, temp);
-			addons[addon_id] = temp.child("info")["version"].str();
+			addons[addon_id] = !temp.empty() ? temp.child("info")["version"].str() : "Unknown";
 		} else {
 			addons[addon_id] = "Unknown";
 		}

src/build_info.cpp

@@ -503,7 +503,7 @@ std::string full_build_report()
 			o << addon_info.first << " : " << addon_info.second << '\n';
 		}
 	}
-
+	o << '\n';
 	return o.str();
 }