Re-add initializer to set mediainfo path

Active encode still uses MediaInfo for the time being so we need to make
sure that variables are still being set up properly.

This commit also adds safe navigation or other conditionals to prevent
errors when MediaInfo or FFmpeg are not defined properly in
Settings.yml.

config/initializers/about_page.rb

@@ -9,7 +9,7 @@
   config.fedora           = AboutPage::Fedora.new(ActiveFedora.fedora.connection)
   config.solr             = AboutPage::Solr.new(ActiveFedora.solr.conn, :numDocs => 1)
   config.database         = Avalon::About::Database.new(User)
-  config.mediainfo        = Avalon::About::MediaInfo.new(path: Settings.mediainfo.path)
+  config.mediainfo        = Settings&.mediainfo&.path ? Avalon::About::MediaInfo.new(path: Settings.mediainfo.path) : Avalon::About::MediaInfo.new()
   config.streaming_server = Avalon::About::HLSServer.new(Settings.streaming.http_base)
   config.sidekiq          = Avalon::About::Sidekiq.new(numProcesses: 1)
   config.redis            = Avalon::About::Redis.new(Redis.new(Rails.application.config.cache_store[1]))

config/initializers/ac_mediainfo.rb

@@ -0,0 +1,2 @@
+# Set up for active_encode, need to happen before active_encode initializer
+ENV["MEDIAINFO_PATH"] ||= Settings.mediainfo.path if Settings&.mediainfo&.path

lib/tasks/avalon_tools.rake

@@ -14,8 +14,8 @@
 
 namespace :avalon do
   namespace :tools do
-    ffmpeg_path    = Settings.ffmpeg.path || "/usr/bin/ffmpeg"
-    mediainfo_path = Settings.mediainfo.path || "/usr/bin/mediainfo"
+    ffmpeg_path    = Settings&.ffmpeg&.path || "/usr/bin/ffmpeg"
+    mediainfo_path = Settings&.mediainfo&.path || "/usr/bin/mediainfo"
     DEFAULT_TOOLS = [
       { name: "ffmpeg", path: ffmpeg_path, version_params: "-version", version_string: ">= 4", version_trim_pre: "ffmpeg version ", version_trim_last_char: "-" },
       { name: "mediainfo", path: mediainfo_path, version_string: "> 18", version_line: 1, version_trim_pre: "MediaInfoLib - v" },