Add tests for GetNamedDests() API.

fpdfsdk/src/fpdfview.cpp

Index: fpdfsdk/src/fpdfview.cpp
diff --git a/fpdfsdk/src/fpdfview.cpp b/fpdfsdk/src/fpdfview.cpp
index 43feaf4d5a9154999eb40c893fbe60ef5b59337a..853d7f76074fe84c5d0f481e506cfdcbd5cfd2ea 100644
--- a/fpdfsdk/src/fpdfview.cpp
+++ b/fpdfsdk/src/fpdfview.cpp
@@ -848,8 +848,10 @@ DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document, int index,
         pDestObj = nameTree.LookupValue(index, bsName);
     }
     if (!pDestObj) return NULL;
-    if (pDestObj->GetType() == PDFOBJ_DICTIONARY)
+    if (pDestObj->GetType() == PDFOBJ_DICTIONARY) {
         pDestObj = ((CPDF_Dictionary*)pDestObj)->GetArray(FX_BSTRC("D"));
+        if (!pDestObj) return NULL;
+    }
     if (pDestObj->GetType() != PDFOBJ_ARRAY) return NULL;
     CFX_WideString wsName = PDF_DecodeText(bsName);
     CFX_ByteString utf16Name = wsName.UTF16LE_Encode();
@@ -860,8 +862,9 @@ DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document, int index,
         memcpy(buffer, utf16Name.c_str(), len);
         ((FX_BYTE*)buffer)[len] = 0;
         ((FX_BYTE*)buffer)[len + 1] = 0;
+        buflen = len + 2;
     } else {
-        len = -1;
+        buflen = -1;
     }
     return (FPDF_DEST)pDestObj;
 }