fix bug in previous commit: fix #311 (add detection of duplicated if else-cases)

lib/checkother.cpp

@@ -3047,9 +3047,6 @@ void CheckOther::checkIncorrectStringCompare()
 
 static const std::string stringifyTokens(const Token *start, const Token *end)
 {
-    if (start == end)
-        return "";
-
     const Token *tok = start;
     std::string stringified = tok->str();
 

test/testother.cpp

@@ -2403,6 +2403,12 @@ private:
 
     void duplicateIf()
     {
+        check("void f(int a, int &b) {\n"
+              "    if (a) { b = 1; }\n"
+              "    else if (a) { b = 2; }\n"
+              "}");
+        ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (style) Found duplicate if expressions.\n", errout.str());
+
         check("void f(int a, int &b) {\n"
               "    if (a == 1) { b = 1; }\n"
               "    else if (a == 2) { b = 2; }\n"