Added dStrIsEmpty and replaced some incorrect string comparisons.

Engine/source/core/strings/stringFunctions.h

@@ -59,6 +59,11 @@ inline S32  dStrcmp(const char *str1, const char *str2)
    return strcmp(str1, str2);   
 }
 
+inline bool dStrIsEmpty(const char *src)
+{
+   return src == 0 || !dStrcmp(src, "");
+}
+
 inline S32  dStrncmp(const char *str1, const char *str2, dsize_t len)
 {
    return strncmp(str1, str2, len);   

Engine/source/gui/worldEditor/terrainEditor.cpp

@@ -2761,9 +2761,9 @@ DefineConsoleMethod(TerrainEditor, getTerrainUnderWorldPoint, S32, (const char *
    if(tEditor == NULL)
       return 0;
    Point3F pos;
-   if(ptOrX != "" && Y == "" && Z == "")
+   if(!dStrIsEmpty(ptOrX) && dStrIsEmpty(Y) && dStrIsEmpty(Z))
       dSscanf(ptOrX, "%f %f %f", &pos.x, &pos.y, &pos.z);
-   else if(ptOrX != "" && Y != "" && Z != "")
+   else if(!dStrIsEmpty(ptOrX) && !dStrIsEmpty(Y) && !dStrIsEmpty(Z))
    {
       pos.x = dAtof(ptOrX);
       pos.y = dAtof(Y);