Filter null markdown extension copies

Author: PrzemyslawKlys

OfficeIMO.Markdown/Blocks/TableBlock.cs

@@ -832,17 +832,23 @@ private static MarkdownReaderOptions CloneOptionsWithoutTables(MarkdownReaderOpt
             : source.InputNormalization;
         clone.FencedBlockExtensions.Clear();
         for (int i = 0; i < source.FencedBlockExtensions.Count; i++) {
-            clone.FencedBlockExtensions.Add(source.FencedBlockExtensions[i]);
+            if (source.FencedBlockExtensions[i] != null) {
+                clone.FencedBlockExtensions.Add(source.FencedBlockExtensions[i]);
+            }
         }
 
         clone.BlockParserExtensions.Clear();
         for (int i = 0; i < source.BlockParserExtensions.Count; i++) {
-            clone.BlockParserExtensions.Add(source.BlockParserExtensions[i]);
+            if (source.BlockParserExtensions[i] != null) {
+                clone.BlockParserExtensions.Add(source.BlockParserExtensions[i]);
+            }
         }
 
         clone.InlineParserExtensions.Clear();
         for (int i = 0; i < source.InlineParserExtensions.Count; i++) {
-            clone.InlineParserExtensions.Add(source.InlineParserExtensions[i]);
+            if (source.InlineParserExtensions[i] != null) {
+                clone.InlineParserExtensions.Add(source.InlineParserExtensions[i]);
+            }
         }
 
         for (int i = 0; i < source.DocumentTransforms.Count; i++) {

OfficeIMO.Markdown/Reader/MarkdownReader.cs

@@ -933,7 +933,9 @@ private static void CopyFencedBlockExtensions(MarkdownReaderOptions source, Mark
 
         for (int i = 0; i < extensions.Count; i++) {
             var extension = extensions[i];
-            target.FencedBlockExtensions.Add(extension);
+            if (extension != null) {
+                target.FencedBlockExtensions.Add(extension);
+            }
         }
     }
 
@@ -950,7 +952,9 @@ private static void CopyBlockParserExtensions(MarkdownReaderOptions source, Mark
 
         for (int i = 0; i < extensions.Count; i++) {
             var extension = extensions[i];
-            target.BlockParserExtensions.Add(extension);
+            if (extension != null) {
+                target.BlockParserExtensions.Add(extension);
+            }
         }
     }
 
@@ -967,7 +971,9 @@ private static void CopyInlineParserExtensions(MarkdownReaderOptions source, Mar
 
         for (int i = 0; i < extensions.Count; i++) {
             var extension = extensions[i];
-            target.InlineParserExtensions.Add(extension);
+            if (extension != null) {
+                target.InlineParserExtensions.Add(extension);
+            }
         }
     }
 

OfficeIMO.Word.Markdown/Converters/MarkdownToWordConverter.cs

@@ -190,7 +190,9 @@ private static void CopyFencedBlockExtensions(Omd.MarkdownReaderOptions source,
 
             for (int i = 0; i < source.FencedBlockExtensions.Count; i++) {
                 var extension = source.FencedBlockExtensions[i];
-                target.FencedBlockExtensions.Add(extension);
+                if (extension != null) {
+                    target.FencedBlockExtensions.Add(extension);
+                }
             }
         }
 
@@ -202,7 +204,9 @@ private static void CopyBlockParserExtensions(Omd.MarkdownReaderOptions source,
 
             for (int i = 0; i < source.BlockParserExtensions.Count; i++) {
                 var extension = source.BlockParserExtensions[i];
-                target.BlockParserExtensions.Add(extension);
+                if (extension != null) {
+                    target.BlockParserExtensions.Add(extension);
+                }
             }
         }