Fix #90: expand_keyword crashed when string ended with tags because of iterator out of bounds.

CHANGES.md

@@ -4,6 +4,9 @@ Magic Set Editor changelog, for the details see `git log`
 HEAD: new items added as changes are made
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+Bug fixes:
+ * Fixed: crash in expand_keywords when given empty tags (#90)
+
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 version 2.1.1, 2020-06-14
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src/data/keyword.cpp

@@ -542,6 +542,7 @@ String expand_keywords(const String& tagged_str, vector<KeywordMatch> const& mat
     // No match, so there is at least one character not part of a keyword
     // and possibly some tags before it that we missed
     skip_tags_for_keyword(true, true);
+    if (it == end) break;
     out += *it;
     ++it;
     ++untagged_pos;