fix object metadata section crash due to un escaped characters

[prakashsvmx]

Closes #2877

fix object metadata section crash due to un escaped characters

upload an object with meta data containing special chars. like

{
        mymeta:"test%special-sybols@~`@#$%^&*()+-_=<>,.?/||\/",
        "more":"test",
        "test1":"test2"
    }

while viewing the object in console, it should not crash.

Result:

[bexsoft]

LGTM