Prevent decrypted data from being printed in the console

[MichaelHallik]

Preconditions & actions:

• Encrypt data, e.g. a string 'test123'.
• For convenience: set 'variable_decryption' to bool 'True'.
• Assign the cipher (i.e. the encrypted string) to a variable, e.g.: ${MY_PLAINTEXT_VAR}.
• Have a test case with one line of code, as follows: Should Be Equal ${MY_PLAINTEXT_VAR} test456
• Run the test case

Expected result:

The test case fails and the console prints (wrt the failed statement):

*** != test456

Actual result:

The test case fails and the console prints (wrt the failed statement):

test123 != test456

Remarks:

In the log *** != test456 is correctly printed.