Add guard clause to iiif_print_ingest_file_relations table

db/migrate/20221205210847_create_iiif_print_derivative_attachments.iiif_print.rb

@@ -1,7 +1,7 @@
 # This migration comes from iiif_print (originally 20181214181358)
 class CreateIiifPrintDerivativeAttachments < ActiveRecord::Migration[5.0]
   def change
-    unless unless table_exists?(:iiif_print_derivative_attachments) 
+    unless table_exists?(:iiif_print_derivative_attachments) 
       create_table :iiif_print_derivative_attachments do |t|
         t.string :fileset_id
         t.string :path

db/migrate/20221205210848_create_iiif_print_ingest_file_relations.iiif_print.rb

@@ -1,12 +1,14 @@
 # This migration comes from iiif_print (originally 20190107165909)
 class CreateIiifPrintIngestFileRelations < ActiveRecord::Migration[5.0]
   def change
-    create_table :iiif_print_ingest_file_relations do |t|
-      t.string :file_path
-      t.string :derivative_path
+    unless table_exists?(:iiif_print_ingest_file_relations)
+      create_table :iiif_print_ingest_file_relations do |t|
+        t.string :file_path
+        t.string :derivative_path
 
-      t.timestamps
+        t.timestamps
+      end
+      add_index :iiif_print_ingest_file_relations, :file_path
     end
-    add_index :iiif_print_ingest_file_relations, :file_path
   end
 end