Bug 883296: returning empty object instead of null when decoding zero length data in Octet.decodeMultiple. r=gene

dom/mobilemessage/src/ril/WspPduHelper.jsm

@@ -239,7 +239,7 @@ this.Octet = {
       throw new RangeError();
     }
     if (end == data.offset) {
-      return null;
+      return [];
     }
 
     let result;
@@ -2291,40 +2291,38 @@ this.PduHelper = {
 
         let octetArray = Octet.decodeMultiple(data, contentEnd);
         let content = null;
-        if (octetArray) {
-          let charset = headers["content-type"].params &&
-                        headers["content-type"].params.charset
-                      ? headers["content-type"].params.charset.charset
-                      : null;
+        let charset = headers["content-type"].params &&
+                      headers["content-type"].params.charset
+                    ? headers["content-type"].params.charset.charset
+                    : null;
 
-          let mimeType = headers["content-type"].media;
+        let mimeType = headers["content-type"].media;
 
-          if (mimeType) {
-            if (mimeType == "application/smil") {
-              // If the content is a SMIL type, convert it to a string.
-              // We hope to save and expose the SMIL content in a string way.
-              content = this.decodeStringContent(octetArray, charset);
-            } else if (mimeType.indexOf("text/") == 0 && charset != "utf-8") {
-              // If the content is a "text/plain" type, we have to make sure
-              // the encoding of the blob content should always be "utf-8".
-              let tmpStr = this.decodeStringContent(octetArray, charset);
-              let encoder = new TextEncoder("UTF-8");
-              content = new Blob([encoder.encode(tmpStr)], {type : mimeType});
+        if (mimeType) {
+          if (mimeType == "application/smil") {
+            // If the content is a SMIL type, convert it to a string.
+            // We hope to save and expose the SMIL content in a string way.
+            content = this.decodeStringContent(octetArray, charset);
+          } else if (mimeType.indexOf("text/") == 0 && charset != "utf-8") {
+            // If the content is a "text/plain" type, we have to make sure
+            // the encoding of the blob content should always be "utf-8".
+            let tmpStr = this.decodeStringContent(octetArray, charset);
+            let encoder = new TextEncoder("UTF-8");
+            content = new Blob([encoder.encode(tmpStr)], {type : mimeType});
 
-              // Make up the missing encoding info.
-              if (!headers["content-type"].params) {
-                headers["content-type"].params = {};
-              }
-              if (!headers["content-type"].params.charset) {
-                headers["content-type"].params.charset = {};
-              }
-              headers["content-type"].params.charset.charset = "utf-8";
+            // Make up the missing encoding info.
+            if (!headers["content-type"].params) {
+              headers["content-type"].params = {};
             }
+            if (!headers["content-type"].params.charset) {
+              headers["content-type"].params.charset = {};
+            }
+            headers["content-type"].params.charset.charset = "utf-8";
           }
+        }
 
-          if (!content) {
-            content = new Blob([octetArray], {type : mimeType});
-          }
+        if (!content) {
+          content = new Blob([octetArray], {type : mimeType});
         }
 
         parts[i] = {