[BUG] Negative phonological search crashes

[stannam]

Describe the bug Phonological search crashes when the user selects all segments and runs negative search.

Sample corpus file 'example' corpus

To Reproduce

1. Go to 'Phonological Search'
2. Select all segments from the inventory
3. Select 'negative'
4. Run search
5. See error

Expected behavior A result table with one row of N/A

Additional context Traceback (most recent call last): File "D:\PycharmProjects\CorpusTools\corpustools\gui\main.py", line 320, in do_check function(self) File "D:\PycharmProjects\CorpusTools\corpustools\gui\main.py", line 335, in do_check function(self) File "D:\PycharmProjects\CorpusTools\corpustools\gui\main.py", line 965, in phonoSearch 'Phonological search results', dialog, self) File "D:\PycharmProjects\CorpusTools\corpustools\gui\views.py", line 863, in init dataModel.setSummarized(True) File "D:\PycharmProjects\CorpusTools\corpustools\gui\models.py", line 633, in setSummarized self._summarize() File "D:\PycharmProjects\CorpusTools\corpustools\gui\models.py", line 589, in _summarize tokenfreq[segenvfilters] += line['Word'].frequency # and add token freq accordingly TypeError: unsupported operand type(s) for +=: 'float' and 'str'

Process finished with exit code 1

[stannam]

Tested on a very simple corpus with only two words. 'A' is a column for orthography, 'C' is for frequency.

A	Transcription	C
a	a.a.a.a	1
b	b	2

1. Negative search for {a, b} (i.e., either [a] or [b]) -- expecting no words in the individual window but should have one row on the summary results
   • summary results

• individual results

2. Negative search for [a] on top of Search 1
   • summary results

• individual results

3. Negative search for [b] out of scratch
   • summary results

• individual results

4. Positive search for [a] on top of Search 3 (just in case)
   • summary results

• individual results