DevTools: Do not crash or hang on console.log()

LayoutTests/inspector/console/console-format-expected.txt

 CONSOLE MESSAGE: line 26: test,test2,,,test4,,,,,
 CONSOLE MESSAGE: line 27: %o
 CONSOLE MESSAGE: line 28: %O
 CONSOLE MESSAGE: line 29: Test for zero "%f" in formatter
 CONSOLE MESSAGE: line 30: %% self-escape1
 CONSOLE MESSAGE: line 31: %%s self-escape2
 CONSOLE MESSAGE: line 32: %%ss self-escape3
 CONSOLE MESSAGE: line 33: %%s%s%%s self-escape4
 CONSOLE MESSAGE: line 34: %%%%% self-escape5
 CONSOLE MESSAGE: line 35: %%%s self-escape6
@@ skipping 48 matching lines @@
 CONSOLE MESSAGE: line 12: function () {}
 CONSOLE MESSAGE: line 13: function () {}
 CONSOLE MESSAGE: line 12: [object Object]
 CONSOLE MESSAGE: line 13: [object Object]
 CONSOLE MESSAGE: line 12: [object SVGSVGElement]
 CONSOLE MESSAGE: line 13: [object SVGSVGElement]
 CONSOLE MESSAGE: line 12: [object Object]
 CONSOLE MESSAGE: line 13: [object Object]
 CONSOLE MESSAGE: line 12: 0
 CONSOLE MESSAGE: line 13: 0
-CONSOLE MESSAGE: line 12: 
-CONSOLE MESSAGE: line 13: 
+CONSOLE MESSAGE: line 12: [object Object]
+CONSOLE MESSAGE: line 13: [object Object]
 CONSOLE MESSAGE: line 12: function Object() { [native code] }
 CONSOLE MESSAGE: line 13: function Object() { [native code] }
 CONSOLE MESSAGE: line 12: [object Object]
 CONSOLE MESSAGE: line 13: [object Object]
 CONSOLE MESSAGE: line 12: function () {}
 CONSOLE MESSAGE: line 13: function () {}
 CONSOLE MESSAGE: line 12: 42
 CONSOLE MESSAGE: line 13: 42
 CONSOLE MESSAGE: line 12: abc
 CONSOLE MESSAGE: line 13: abc
@@ skipping 139 matching lines @@
 function () {} console-format.html:62
 Number {[[PrimitiveValue]]: 42} console-format.html:12
 [Number]0: Numberlength: 1__proto__: Array[0] console-format.html:13
 globals[31]
 Number {[[PrimitiveValue]]: 42}
 String {0: "a", 1: "b", 2: "c", length: 3, [[PrimitiveValue]]: "abc"} console-format.html:12
 [String]0: Stringlength: 1__proto__: Array[0] console-format.html:13
 globals[32]
 String {0: "a", 1: "b", 2: "c", length: 3, [[PrimitiveValue]]: "abc"}