Merge pull request #2561 from secondlife/brad/2553-about-sl-crash-locale-init

secondlife/viewer#2553 about sl crash locale init

indra/llcommon/llstring.cpp

@@ -1410,6 +1410,14 @@ bool LLStringUtil::simpleReplacement(std::string &replacement, std::string token
 template<>
 void LLStringUtil::setLocale(std::string inLocale)
 {
+    if(startsWith(inLocale, "MissingString"))
+    {
+        // it seems this hasn't been working for some time, and I'm not sure how it is intentded to
+        // properly discover the correct locale.  early out now to avoid failures later in
+        // formatNumber()
+        LL_WARNS() << "Failed attempting to set invalid locale: " << inLocale << LL_ENDL;
+        return;
+    }
     sLocale = inLocale;
 };