DRTVWR-418: Fix streamtools test.

When std::istream::good() returns false, presumably we can no longer rely on
get() returning valid data. Certain streamtools tests were assuming that get()
would return the empty string at EOF, but in fact it appears that it left the
previous buffer contents unmodified.

indra/test/llstreamtools_tut.cpp

@@ -149,10 +149,9 @@ namespace tut
 
 		is.clear();
 		is.str(str = "#    \r\n  #  SecondLife is a 3D World. ##");
-		skip_comments_and_emptyspace(is);
-		is.get(arr, 255, '\0');
-		expected_result = "";
-		ensure_equals("skip_comments_and_emptyspace: skip comment - 2", arr, expected_result);
+		ensure("should not be good()", ! skip_comments_and_emptyspace(is));
+		ensure("should be at eof()", is.eof());
+		// don't get(): given bad state, we can't rely on results
 
 		is.clear();
 		is.str(str = " \r\n  SecondLife is a 3D World. ##");
@@ -164,14 +163,12 @@ namespace tut
 		is.clear();
 		is.str(str = "");
 		ret = skip_comments_and_emptyspace(is);
-		is.get(arr, 255, '\0');
-		ensure("skip_comments_and_emptyspace: empty string", ret == false);
+		ensure("skip_comments_and_emptyspace: empty string", ! ret);
 
 		is.clear();
 		is.str(str = "  \r\n  \t # SecondLife is a 3D World");
 		ret = skip_comments_and_emptyspace(is);
-		is.get(arr, 255, '\0');
-		ensure("skip_comments_and_emptyspace: space newline comment empty", ret == false);
+		ensure("skip_comments_and_emptyspace: space newline comment empty", ! ret);
 	}
 	
 	//testcases for skip_line()