Resolve "Check input for URI format upon calling a connect method"

Closes #22 (closed)

ragconnect.base/src/main/resources/handleUri.mustache

-String scheme,host, path;
+String scheme, host, path;
 java.net.URI uri;
 try {
   uri = new java.net.URI({{connectParameterName}});
@@ -9,3 +9,15 @@ try {
   System.err.println(e.getMessage());  // Maybe re-throw error?
   return false;
 }
+if (scheme == null || scheme.isBlank()) {
+  System.err.println("Missing or empty scheme in " + uri);
+  return false;
+}
+if (host == null || host.isBlank()) {
+  System.err.println("Missing or empty host in " + uri);
+  return false;
+}
+if (path == null || path.isBlank()) {
+  System.err.println("Missing or empty path in " + uri);
+  return false;
+}