Fix infinite loop for jpd generation with no files

Author: mjprilliman

deploy/runtime/ui/Marine Wave Resource Time Series.json

@@ -1029,7 +1029,7 @@
         "\t\tif (file != '') {",
         "\t\t\terr = make_jpd_multiyear(folder, slash_back_to_forward(file));",
         "\t\t\tif (err != \"\")  {\r",
-        "\t\t\t\tmsgbox(\"Error reading file: \" + err);\r",
+        "\t\t\t\tmsgbox(\"Error creating JPD: \" + err);\r",
         "\t\t\t\treturn;\r",
         "\t\t\t}\r",
         "\t\t\tfile_path = path_only(file);",

src/invoke.cpp

@@ -4586,6 +4586,7 @@ void fcall_make_jpd_multiyear(lk::invoke_t& cxt)
             wxLogStatus("error scanning '" + wf + "'");
             //cxt.error(err);
             cxt.result().assign(err);
+            has_more = dir.GetNext(&file);
             continue;
         }
         else