detect invalid param in aconvert

aconvert2/src/aconvert.cpp

@@ -244,6 +244,8 @@ int main ( int argc, char * argv[] ) {
 			treeFromString ( * in, std::cout );
 		else if ( tree_to_string.getValue ( ) )
 			treeToString ( * in, std::cout );
+		else
+			throw exception::CommonException("Invalid format specified");
 		if ( input.isSet ( ) && ( input.getValue ( ) != "-" ) )
 			delete in;

araw2/src/araw.cpp

@@ -112,7 +112,7 @@ int main(int argc, char** argv) {
 			string::StringToRawComposer::compose(std::cout, string);
 		} else {
-			throw exception::CommonException("Invalid input format specified");
+			throw exception::CommonException("Invalid format specified");
 		}
 		measurements::end();