Resolve compilation error with G++ 4.9.

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
index e9c0fdd227ea6eaffd9155cffe24142010b2bed1..964c3ca9521a3a090a31b68937fe89f7ab3d296b 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -2185,6 +2185,11 @@ CPDF_Object* CPDF_SyntaxParser::GetObject(CPDF_IndirectObjects* pObjList, FX_DWO
             }
             nKeys ++;
             key = PDF_NameDecode(key);
+            if (key.IsEmpty()) {

[jun_fang, 2014/10/29 18:21:50]

IsEmpty is checked at Ln2168. If key is not empty before Ln2187, it shall not be
empty after the function of PDF_NameDecode. Do you think it's necessary to add
another check here?

+                if (pDict)
+                    pDict->Release();
+                return NULL;
+            }
             if (key == FX_BSTRC("/Contents")) {
                 dwSignValuePos = m_Pos;
             }