Give meaningful error message when essential info is missing from config file.

launch_IDE.R

@@ -30,6 +30,12 @@ if(length(args) < 1 || !is.toml.file(args[1])) {
   # Read TOML file and populate IDE variables
   ide.config <- read.config(file = args[1])
 }
+if(is.null(ide.config$data$data_root) || ide.config$data$data_root == "") {
+  stop(paste0("data.data_root must be defined in config file ", args[1]))
+}
+if(is.null(ide.config$data$table_path) || ide.config$data$table_path == "") {
+  stop(paste0("data.table_path must be defined in config file ", args[1]))
+}
 
 shiny::runApp(ide.path, 
               host = "0.0.0.0",