Show explicit error message when field name missed in table header

[mgurov]

instead of a StringIndexOutOfBoundsException:

java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(String.java:658)
  at cucumber.runtime.table.CamelCaseStringConverter.uncapitalize(CamelCaseStringConverter.java:37)
  at cucumber.runtime.table.CamelCaseStringConverter.map(CamelCaseStringConverter.java:13)
  at cucumber.runtime.table.TableConverter$1.map(TableConverter.java:284)
  at cucumber.runtime.table.TableConverter$1.map(TableConverter.java:281)
  at gherkin.util.FixJava.map(FixJava.java:28)
  at cucumber.runtime.table.TableConverter.convertTopCellsToFieldNames(TableConverter.java:281)
  at cucumber.runtime.table.TableConverter.toListOfComplexType(TableConverter.java:101)
  at cucumber.runtime.table.TableConverter.convert(TableConverter.java:91)
  at cucumber.runtime.StepDefinitionMatch.tableArgument(StepDefinitionMatch.java:97)

Motivation: when doing a larger refactoring on somewhat oversized tables it was not instantly clear what went wrong.

[mpkorstanje]

Cheers!

[lock]

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