Backport of MAGETWO-52102 for Magento 2.1: [Github] Custom theme static content won't deploy without overriding at least one static content file #3754

(cherry picked from commit 6a9744d)

Author: shiftedreality

lib/internal/Magento/Framework/App/Utility/Files.php

@@ -890,6 +890,16 @@ private function accumulateThemeStaticFiles($area, $locale, $filePattern, &$resu
                         throw new \UnexpectedValueException("Could not parse theme static file '$file'");
                     }
                 }
+
+                if (!$files) {
+                    $result[] = [
+                        $themeArea,
+                        $themePackage->getVendor() . '/' . $themePackage->getName(),
+                        null,
+                        null,
+                        null,
+                    ];
+                }
             }
         }
     }