Prevent public data requests with NRT

[pep8speaks]

Hello @volodymyrss! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file cdci_osa_plugin/osa_dataserve_dispatcher.py:

Line 700:1: W293 blank line contains whitespace Line 710:9: E303 too many blank lines (2) Line 712:80: E501 line too long (100 > 79 characters) Line 713:80: E501 line too long (138 > 79 characters) Line 715:80: E501 line too long (148 > 79 characters) Line 716:69: E128 continuation line under-indented for visual indent Line 716:80: E501 line too long (142 > 79 characters)

[volodymyrss]

will de-hotfix