@@ -5,6 +5,12 @@ Object.defineProperty(exports, "__esModule", {
 });
 exports.default = void 0;
 var _humps = require("humps");
+// The backend reads an absent field as "none" and parses several as JSON. A value the editor
+// does not have (undefined) would otherwise go out as the string "undefined", which fails
+// to parse.
+const appendDefined = (data, key, value) => {
+  if (value !== undefined) data.append(key, value);
+};
 const convertFile = target => {
   const {
     file,
@@ -46,23 +52,23 @@ const saveFile = target => {
   const data = new FormData();
   data.append('src', src);
   data.append('dst', dst);
-  data.append('molfile', mol);
-  data.append('filename', filename);
-  data.append('peaks_str', peakStr);
+  appendDefined(data, 'molfile', mol);
+  appendDefined(data, 'filename', filename);
+  appendDefined(data, 'peaks_str', peakStr);
   if (shift) {
-    data.append('shift_select_x', shift.peak.x);
-    data.append('shift_ref_name', shift.ref.name);
-    data.append('shift_ref_value', shift.ref.value);
+    appendDefined(data, 'shift_select_x', shift.peak.x);
+    appendDefined(data, 'shift_ref_name', shift.ref.name);
+    appendDefined(data, 'shift_ref_value', shift.ref.value);
   }
-  data.append('mass', mass);
-  data.append('scan', scan);
-  data.append('thres', thres);
-  data.append('predict', predict);
-  data.append('integration', integration);
-  data.append('multiplicity', multiplicity);
-  data.append('wave_length', waveLength);
-  data.append('cyclic_volta', cyclicvolta);
-  data.append('dsc_meta_data', dscMetaData);
+  appendDefined(data, 'mass', mass);
+  appendDefined(data, 'scan', scan);
+  appendDefined(data, 'thres', thres);
+  appendDefined(data, 'predict', predict);
+  appendDefined(data, 'integration', integration);
+  appendDefined(data, 'multiplicity', multiplicity);
+  appendDefined(data, 'wave_length', waveLength);
+  appendDefined(data, 'cyclic_volta', cyclicvolta);
+  appendDefined(data, 'dsc_meta_data', dscMetaData);
   if (dstList) {
     dstList.forEach(dstFile => {
       data.append('dst_list', dstFile);
@@ -122,20 +128,20 @@ const refreshFile = target => {
   const data = new FormData();
   data.append('src', src);
   data.append('dst', dst);
-  data.append('molfile', mol);
-  data.append('filename', filename);
-  data.append('peaks_str', peakStr);
-  data.append('shift_select_x', shift.peak.x);
-  data.append('shift_ref_name', shift.ref.name);
-  data.append('shift_ref_value', shift.ref.value);
-  data.append('mass', mass);
-  data.append('scan', scan);
-  data.append('thres', thres);
-  data.append('predict', predict);
-  data.append('integration', integration);
-  data.append('multiplicity', multiplicity);
-  data.append('wave_length', waveLength);
-  data.append('cyclic_volta', cyclicvolta);
+  appendDefined(data, 'molfile', mol);
+  appendDefined(data, 'filename', filename);
+  appendDefined(data, 'peaks_str', peakStr);
+  appendDefined(data, 'shift_select_x', shift.peak.x);
+  appendDefined(data, 'shift_ref_name', shift.ref.name);
+  appendDefined(data, 'shift_ref_value', shift.ref.value);
+  appendDefined(data, 'mass', mass);
+  appendDefined(data, 'scan', scan);
+  appendDefined(data, 'thres', thres);
+  appendDefined(data, 'predict', predict);
+  appendDefined(data, 'integration', integration);
+  appendDefined(data, 'multiplicity', multiplicity);
+  appendDefined(data, 'wave_length', waveLength);
+  appendDefined(data, 'cyclic_volta', cyclicvolta);
   if (dstList) {
     dstList.forEach(dstFile => {
       data.append('dst_list', dstFile);