fix: do not throw errors on empty image descriptions (#5)

Input: ```md ![] ``` Before: ``` error ``` After: ``` (document [0, 0] - [0, 4] (paragraph [0, 0] - [0, 4] (text [0, 0] - [0, 4]))) ```
ikatyang · Apr 26, 2020 · 994f572 · 994f572
1 parent 67975ef
commit 994f572
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diff --git a/corpus/custom.txt b/corpus/custom.txt
@@ -912,3 +912,14 @@ Unnamed 2
       (text))
     (link_destination
       (text))))
+
+================================================================================
+Empty Image Description
+================================================================================
+![]
+
+--------------------------------------------------------------------------------
+
+(document
+  (paragraph
+    (text)))
diff --git a/src/tree_sitter_markdown/inline_scan.cc b/src/tree_sitter_markdown/inline_scan.cc
@@ -1898,7 +1898,7 @@ void hdl_unpaired_inl_dlm(Lexer &lxr, InlineDelimiterList &inl_dlms, InlineConte
     }
     inl_ctx_stk.pop();
     unpaired_dlm_itr = inl_ctx_stk.back().dlm_itr();
-    assert(unpaired_dlm_itr->sym() == SYM_LNK_BGN);
+    assert(unpaired_dlm_itr->sym() == SYM_LNK_BGN || unpaired_dlm_itr->sym() == SYM_IMG_BGN);
   }
   switch (unpaired_dlm_itr->sym()) {
     case SYM_ASR_BGN: