Android: Add pseudo module for Android Studio

build/android/gradle/android.jinja

Index: build/android/gradle/android.jinja
diff --git a/build/android/gradle/android.jinja b/build/android/gradle/android.jinja
index 197f98f298c2f01e416212578fcc1240254b6cf1..c2024662eea579a2468443c6876ba119295e5e6f 100644
--- a/build/android/gradle/android.jinja
+++ b/build/android/gradle/android.jinja
@@ -5,28 +5,34 @@
 {% if variables is defined %}
         {{ prefix }} {
             manifest.srcFile "{{ variables.android_manifest }}"
+{% if variables.java_dirs is defined %}
             java.srcDirs = [
 {% for path in variables.java_dirs %}
                 "{{ path }}",
 {% endfor %}
             ]
-{% if variables.java_excludes %}
+{% endif %}
+{% if variables.java_excludes is defined %}
             java.filter.exclude(
 {% for path in variables.java_excludes %}
                 "{{ path }}",
 {% endfor %}
             )
 {% endif %}
+{% if variables.jniLibs is defined %}
             jniLibs.srcDirs = [
 {% for path in variables.jni_libs %}
                 "{{ path }}",
 {% endfor %}
             ]
+{% endif %}
+{% if variables.res_dirs is defined %}
             res.srcDirs = [
 {% for path in variables.res_dirs %}
                 "{{ path }}",
 {% endfor %}
             ]
+{% endif %}
         }
 {% endif %}
 {% endmacro %}