config: be a little less cryptic on what's going on in load_default_profile().

config_parser.c

@@ -658,12 +658,22 @@ void load_default_profile()
 {
   struct profile *profile;
 
-  //if a default profile name is set
-  if(!empty_string(default_profile.name))
+  if(empty_string(default_profile.name))
   {
-    //find profile and copy settings
-    if((profile = get_profile(default_profile.name)))
+    applog(LOG_WARNING, "Default profile name not set.");
+    return;
+  }
+  else
   {
+    // find profile ...
+    profile = get_profile(default_profile.name);
+    if (!profile) {
+      applog(LOG_WARNING, "Could not load default profile %s",
+	     default_profile.name);
+      return;
+    }
+
+    // ... and copy settings
     default_profile.algorithm = profile->algorithm;
     default_profile.devices = profile->devices;
     default_profile.lookup_gap = profile->lookup_gap;
@@ -683,7 +693,6 @@ void load_default_profile()
     default_profile.worksize = profile->worksize;
   }
 }
-}
 
 //apply default settings
 void apply_defaults()