Merge pull request #7304 from tautschnig/bugfixes/4327-cpplint-empty-modules

cpplint custom check: support empty module_dependencies.txt

Author: tautschnig

regression/cpp-linter/assert/module_dependencies.txt

@@ -0,0 +1 @@
+

regression/cpp-linter/includes/main.cpp

@@ -0,0 +1,7 @@
+// Author: Michael Tautschnig
+
+#include <util/other.h>
+
+int main(int argc, char **argv)
+{
+}

regression/cpp-linter/includes/module_dependencies.txt

@@ -0,0 +1 @@
+

regression/cpp-linter/includes/test.desc

@@ -0,0 +1,7 @@
+CORE
+main.cpp
+
+^regression/cpp-linter/includes/main.cpp:3:  Module `` must not use `util/other.h`  \[build/include\] \[4\]
+^# Total errors found: 1$
+^EXIT=1$
+^SIGNAL=0$

scripts/cpplint.py

@@ -5633,7 +5633,7 @@ def CheckIncludeLine(filename, clean_lines, linenum, include_state, error, modul
     if has_src >= 0:
         module_name = module_name[has_src+4:]
     deps_name = os.path.dirname(include)
-    if deps_name and module_deps:
+    if deps_name and module_deps is not None:
         may_use = any(deps_name.startswith(module) for module in module_deps)
         if not may_use:
             error(filename, linenum, 'build/include', 4,