Issue #190: PageMaster crash + black bubbles instead of bubbles with correct color

Pdf4QtLibCore/sources/pdfdocumentbuilder.cpp

@@ -1284,6 +1284,19 @@ void PDFDocumentBuilder::mergeNames(PDFObjectReference a, PDFObjectReference b)
     const PDFDictionary* aDict = getDictionaryFromObject(aObject);
     const PDFDictionary* bDict = getDictionaryFromObject(bObject);
 
+    PDFDictionary aDictDummy;
+    PDFDictionary bDictDummy;
+
+    if (!aDict)
+    {
+        aDict = &aDictDummy;
+    }
+
+    if (!bDict)
+    {
+        bDict = &bDictDummy;
+    }
+
     // Store keys
     std::set<QByteArray> keys;
     for (size_t i = 0; i < aDict->getCount(); ++i)

Pdf4QtLibCore/sources/pdftransparencyrenderer.cpp

@@ -1245,6 +1245,9 @@ bool PDFTransparencyRenderer::isContentKindSuppressed(ContentKind kind) const
             }
             break;
 
+        case ContentKind::Forms:
+            return false;
+
         default:
             Q_ASSERT(false);
             break;