Fixed panic when body type changed from array to object

[derbylock]

Fixed panic in RequestPropertyTypeChangedCheck

Example of panic:

runtime error: invalid memory address or nil pointer dereference
goroutine 1 [running]:
runtime/debug.Stack()
	/usr/local/go/src/runtime/debug/stack.go:24 +0x65
main.(*App).Execute.func1()
...
	/usr/local/go/src/runtime/panic.go:884 +0x212
github.com/tufin/oasdiff/checker.RequestPropertyTypeChangedCheck.func1({0xc0008bd366?, 0x7fab3586d108?}, {0x0?, 0x4eb385?}, 0xc0008bd370?, 0xc0008bd370?)
	/home/user/go/pkg/mod/github.com/tufin/[email protected]/checker/check-request-property-type-changed.go:52 +0x40
github.com/tufin/oasdiff/checker.processModifiedPropertiesDiff({0xc0008bd366, 0x6}, {0x0, 0x0}, 0xc0006d5760, 0x203000?, 0xc000cac958)
	/home/user/go/pkg/mod/github.com/tufin/[email protected]/checker/checks-utils.go:61 +0x7c
github.com/tufin/oasdiff/checker.processModifiedPropertiesDiff({0x0?, 0x21adb60?}, {0x0?, 0x4?}, 0xc0006d5600, 0x158e709?, 0xc000cac958)

Addtionally, fixed small typos in messages

[blva]

LGTM (you may need to update breaking changes file again)

[codecov-commenter]

Codecov Report

Merging #357 (bf4da33) into main (30738ef) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
- Coverage   80.93%   80.92%   -0.01%     
==========================================
  Files         194      194              
  Lines       10536    10531       -5     
==========================================
- Hits         8527     8522       -5     
  Misses       1683     1683              
  Partials      326      326              

Flag	Coverage Δ
unittests	80.92% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
checker/check-request-property-type-changed.go	94.93% <100.00%> (+0.19%)	⬆️
diff/schema_diff.go	79.19% <100.00%> (-1.07%)	⬇️

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[derbylock]

LGTM (you may need to update breaking changes file again)

I rerun ./make and it doesn't change BREAKING-CHANGES-EXAMPLES.md

Could you help me, please?

[derbylock]

Looks like the order of lines in BREAKING-CHANGES-EXAMPLES.md is different on my machine and on github build nodes. I don't know what to do. I cant apply patch from build's log but it seems strange to solve such problems this way.