[Email Thread] Display registered and not registered receivers

ticket https://code.vereign.com/code/dashboard/issues/401

javascript/src/helpers/mailparser.js

@@ -154,7 +154,7 @@ export function parseMIME(mime) {
 
   parts.push({
     indices: { from: 0, to: mime.length, headersEnd: headersEnd },
-    headers: headers,
+    headers,
     boundary: "mimemessage"
   });
 
@@ -162,19 +162,11 @@ export function parseMIME(mime) {
 }
 
 function getHeaderValue(header, part) {
-  if (part.headers !== null && part.headers !== undefined) {
-    if (part.headers[header] !== null && part.headers[header] !== undefined) {
-      if (part.headers[header].length > 0) {
-        return part.headers[header];
-      } else {
-        return null;
-      }
-    } else {
-      return null;
-    }
-  } else {
-    return null;
+  if (part.headers && part.headers[header] && part.headers[header].length) {
+    return part.headers[header];
   }
+
+  return null;
 }
 
 export function getGlobalHeaderValue(header, parts) {
@@ -198,7 +190,7 @@ function getBody(mime, part) {
 }
 
 export function decodeMimeBody(descriptor, mimeString) {
-  let mimeBody = mimeString.slice(
+  const mimeBody = mimeString.slice(
     descriptor.indices.headersEnd,
     descriptor.indices.to
   );
@@ -308,7 +300,9 @@ export function getPlain(mime, parts) {
       break;
     }
   }
-
+  if (!plainPart) {
+    return "";
+  }
   plain = decodeMimeBody(plainPart, mime);
   return plain;
 }