Print a warning in case a fallback value wasn't found

components/fallback/fallback.cpp

@@ -1,5 +1,7 @@
 #include "fallback.hpp"
 
+#include <iostream>
+
 #include <boost/lexical_cast.hpp>
 
 
@@ -17,6 +19,7 @@ namespace Fallback
         std::map<std::string,std::string>::const_iterator it;
         if((it = mFallbackMap.find(fall)) == mFallbackMap.end())
         {
+            std::cerr << "Warning: fallback value " << fall << " not found." << std::endl;
             return "";
         }
         return it->second;
@@ -25,7 +28,7 @@ namespace Fallback
     float Map::getFallbackFloat(const std::string& fall) const
     {
         std::string fallback=getFallbackString(fall);
-        if(fallback.empty())
+        if (fallback.empty())
             return 0;
         else
             return boost::lexical_cast<float>(fallback);
@@ -34,7 +37,7 @@ namespace Fallback
     int Map::getFallbackInt(const std::string& fall) const
     {
         std::string fallback=getFallbackString(fall);
-        if(fallback.empty())
+        if (fallback.empty())
             return 0;
         else
             return std::stoi(fallback);
@@ -43,7 +46,7 @@ namespace Fallback
     bool Map::getFallbackBool(const std::string& fall) const
     {
         std::string fallback=getFallbackString(fall);
-        if(fallback.empty())
+        if (fallback.empty())
             return false;
         else
             return stob(fallback);
@@ -52,7 +55,7 @@ namespace Fallback
     osg::Vec4f Map::getFallbackColour(const std::string& fall) const
     {
         std::string sum=getFallbackString(fall);
-        if(sum.empty())
+        if (sum.empty())
             return osg::Vec4f(0.5f,0.5f,0.5f,1.f);
         else
         {