JavaScript Highlighter: Fix potential infinite loop on bad input

MongoView/Synax Highlighting/JavaScriptHighlighter.swift

@@ -225,8 +225,6 @@ class JavaScriptHighlighter {
             consumeDotLookup()
         } else if char == "?" {
             consumeTernaryExpression()
-        } else if expressionEnds.contains(char) {
-            return
         } else {
             consume()
         }