Fix #8685, Check nil condition for #wordlist_file in jtr modules

JTR modules should never assume there is always a database
connected while using #wordlist_file, considering a database is
an optional component for Framework.

Fix #8685

modules/auxiliary/analyze/jtr_aix.rb

@@ -32,6 +32,11 @@ class MetasploitModule < Msf::Auxiliary
 
     # generate our wordlist and close the file handle
     wordlist = wordlist_file
+    unless wordlist
+      print_error('This module cannot run without a database connected. Use db_connect to connect to a database.')
+      return
+    end
+
     wordlist.close
     print_status "Wordlist file written out to #{wordlist.path}"
     cracker.wordlist = wordlist.path

modules/auxiliary/analyze/jtr_crack_fast.rb

@@ -31,6 +31,11 @@ class MetasploitModule < Msf::Auxiliary
 
     # generate our wordlist and close the file handle
     wordlist = wordlist_file
+    unless wordlist
+      print_error('This module cannot run without a database connected. Use db_connect to connect to a database.')
+      return
+    end
+
     wordlist.close
     print_status "Wordlist file written out to #{wordlist.path}"
     cracker.wordlist = wordlist.path

modules/auxiliary/analyze/jtr_linux.rb

@@ -46,6 +46,11 @@ class MetasploitModule < Msf::Auxiliary
 
     # generate our wordlist and close the file handle
     wordlist = wordlist_file
+    unless wordlist
+      print_error('This module cannot run without a database connected. Use db_connect to connect to a database.')
+      return
+    end
+
     wordlist.close
     print_status "Wordlist file written out to #{wordlist.path}"
     cracker.wordlist = wordlist.path

modules/auxiliary/analyze/jtr_mssql_fast.rb

@@ -33,6 +33,11 @@ class MetasploitModule < Msf::Auxiliary
 
     # generate our wordlist and close the file handle
     wordlist = wordlist_file
+    unless wordlist
+      print_error('This module cannot run without a database connected. Use db_connect to connect to a database.')
+      return
+    end
+
     wordlist.close
     print_status "Wordlist file written out to #{wordlist.path}"
     cracker.wordlist = wordlist.path

modules/auxiliary/analyze/jtr_mysql_fast.rb

@@ -32,6 +32,11 @@ class MetasploitModule < Msf::Auxiliary
 
     # generate our wordlist and close the file handle
     wordlist = wordlist_file
+    unless wordlist
+      print_error('This module cannot run without a database connected. Use db_connect to connect to a database.')
+      return
+    end
+
     wordlist.close
     print_status "Wordlist file written out to #{wordlist.path}"
     cracker.wordlist = wordlist.path

modules/auxiliary/analyze/jtr_postgres_fast.rb

@@ -36,6 +36,11 @@ class MetasploitModule < Msf::Auxiliary
 
     # generate our wordlist and close the file handle
     wordlist = wordlist_file
+    unless wordlist
+      print_error('This module cannot run without a database connected. Use db_connect to connect to a database.')
+      return
+    end
+
     wordlist.close