#1130: improve behaviour on ambigous xpath match

[leonrohne27]

Fixes: #1130

Implements:

• Now logs a warning instead of an error + stacktrace
• Instead of raising an exception that prevents the merge, it now takes the first match of the XPath and merges that

[coveralls]

Pull Request Test Coverage Report for Build 13918986572

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 67.657%

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Totals
Change from base Build 13918607876:	0.0%
Covered Lines:	7825
Relevant Lines:	11138

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 13990864868

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 13 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 67.667%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/merge/xmlmerger/XmlMergeStrategy.java	2	84.29%
com/devonfw/tools/ide/merge/xmlmerger/matcher/IdComputer.java	11	72.86%

Totals
Change from base Build 13987579828:	-0.02%
Covered Lines:	7832
Relevant Lines:	11146

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💛 - Coveralls

[hohwille]

@leonrohne27 thanks for your PR. You already solved the problem 👍
Have a look at my review comments to complete the story and avoid undesired other behaviour. Then we can merge this.